Propensity has always been available for free with KindleUnlimited. For the first time ever, Propensity will be free for all available markets between 12 and 16 December 2025. Limited-time offer. Not sure how this operates across time zones. Download it sooner than later so you don’t miss the opportunity.
Propensity is also available in hardcover and paperback, as well as an audiobook. Scroll down to listen to chapter 1.
Also available at Barnes & Noble, if that’s your preference – hardcover and paperback.
Summaries and a trailer are available below.
I’m offering Propensity in the hope of getting some reviews and comments, whether here or on the site of purchase. Goodreads reviews are nice, too. You can be the first.
Image: Mockup of Propensity in a Kindle reader frame
Propensity is a story in three sections: Implementation, Drift, and Entropic. Google Gemini summarised each section; NotebookLM summarised those. Listen below.
Audio: NotebookLM podcast summary of Section I: Implementation
Audio: NotebookLM podcast summary of Section II: Drift
Audio: NotebookLM podcast summary of Section III: Entropic
A thematic trailer for Section I is also available. I hope to make more.
I’ve finally given Propensity a trailer. This short piece captures the first of the novel’s three movements – the ‘scientific’ phase, when everything still believes it’s under control. Except for this cover image, I used no AI. Except for the book covers, all assets – video clips and soundtrack – came from Motion Array
There may be another to follow, drawn from the second section, where control begins to crack. For now, consider this a visual prelude: thirty-two seconds of atmosphere, code, and quiet collapse.
Propensity is available in print and eBook in the usual places – online or at your local bookseller.
John Hartness, from Falstaff Books, recently noted that not all books translate well to audio. He’s right, and this isn’t a fan letter, just a nod to the truth of it. Every format has its own physics. Some stories bend beautifully. Others snap.
Video: John Hartness discusses the ins and outs of audiobooks.
Propensity is one of the snappers. It doesn’t behave on Kindle, either. That’s less a fault of the text than the medium. Its structure and typography do a lot of the storytelling, and when those are flattened to fit an algorithmic page template, something human is lost. I include the visual material as a PDF for the curious, but the audiobook can only gesture at what’s missing. No amount of verbal description replaces the architecture of the page.
Audio: NotebookLM podcast on this topic.
I listen to audiobooks constantly – commuting used to be my second job – but there’s a difference between hearing a story and parsing a spreadsheet by ear. Nonfiction especially suffers: tables, diagrams, anything spatially meaningful. Description isn’t substitution; it’s triage.
Musicians met this problem decades ago. When the Beatles stopped touring in 1966, it wasn’t vanity; it was liberation. They no longer had to replicate their studio work on stage. Garbage later flipped that logic: they engineered songs to survive live. The same divide holds for writers. Some build books that breathe on paper. Others craft ones that perform well through speakers. Neither camp is wrong.
When I produced records, my job was to capture the best possible experience – not the most ‘authentic’ performance. Now, with digital tools, some artists never play their own songs from start to finish until tour rehearsals. The copy-paste perfection of ProTools turns spontaneity into ornament. E-books and AI summaries do the same for text—efficient, portable, bloodless.
So, yes, formats matter. They always have. Paper isn’t just nostalgia; it’s part of the meaning. And while I’m happy to share Propensity however readers find it, I know where it breathes best: between real pages, under real light, in the one format that doesn’t pretend to be frictionless.
That’s the first line of Chapter 26, ‘Simulacra’, in Propensity. A small, airless room. A flickering light. Three teenagers – Teddy, Lena, Jamal – trying to remember what morality looked like before the world stopped watching.
This chapter is written as a script, not prose. Directions, shots, and camera pans replace internal monologue. The reader becomes the lens – an observer, never a participant. It’s deliberate. In a story about imitation and collapse, the camera itself becomes the narrator, the conscience, and the judge.
Audio: NotebookLM podcast on this topic.
The camera pushes through the door, searching. Dust floats in suspension, and time feels posthumous. Teddy zips his hoodie over bare skin; Jamal leans in the doorway, arms folded, disgust simmering behind teenage boredom.
JAMAL You can’t just be shagging Gormies, mate.
TEDDY That’s the point, innit?
Their exchange isn’t only about sex; it’s about the boundaries of what still counts as human. ‘Gormies’ are the gormless – the emptied remnants of pre-collapse society. They can’t consent or refuse. They’re alive but vacant. Human-shaped absences.
Teddy’s logic is brutal and pure simulation: if the subject can’t say no, the act ceases to carry meaning. He performs the motion of sin without the structure of morality.
Jamal’s recoil isn’t righteous; it’s aesthetic. He’s repulsed by Teddy’s theatre of transgression, the same way one might flinch at bad acting.
NB: Download this entire chapter as a PDF on the Propensity page.
Image: Page 125 of Propensity, Chapter 26 – Simulacra.
26 · Simulacra
INT. FLAT – BEDROOM – LATE AFTERNOON The room smells like a tin of low tide. CAMERA: SLOW DOLLY IN from hallway, pushing through the open door into a dim, dust-suspended interior. Thin curtains bleed grey light onto water-stained wallpaper. The ceiling flickers from a dying fluorescent. A single, empty BED lies unmade in the centre – crumpled sheets, a dent in the mattress. CAMERA: HOLD ON WIDE SHOT, framing the bed dead centre, with figures occupying the room’s periphery. TEDDY (14) zips up his hoodie. Shirtless underneath. Sweat drying on his chest. He leans against the flaking wall, chewing on a broken fingernail. CAMERA: SLOW PAN RIGHT to JAMAL (16), posted near the doorway, arms crossed. He watches Teddy, face unreadable but for the curl of disgust on his lip.
The title Simulacra is a nod to Jean Baudrillard’s Simulacra and Simulation, the philosophical text the Wachowskis borrowed – and misunderstood – forThe Matrix. Baudrillard didn’t mean that the world was an illusion hiding the truth. He meant that the distinction between illusion and truth had already evaporated.
The real no longer disappears behind its representation; it becomes its representation. The sign replaces the substance.
In this scene, Teddy, Jamal, and Lena are copies of moral beings without moral context. They mimic the gestures of civilisation – disgust, guilt, justice – without the living institutions that once gave those words gravity. They don’t believe in morality; they reenact it.
Baudrillard called this the third order of simulacra: when the copy no longer hides the absence of reality but replaces it entirely.
JAMAL You can’t just be shagging Gormies, mate. TEDDY (grinning) That’s the point, innit? (smirking toward the bed) She’s gormless. Don’t care. None of them do. CAMERA: CUT TO TIGHT SHOT – Teddy’s face. The smile is too wide. Forced. CAMERA: OVER JAMAL’S SHOULDER, the bed is empty now, but the shape in the sheet tells a story. JAMAL That’s Lena’s mum. CAMERA: CUT TO CLOSE-UP – Teddy blinks. Shrugs. TEDDY Didn’t know Lena, did I? (beat) CAMERA: SLOW REVEAL – LENA (15) stands in shadow. Hood up. Motionless in the corner. LENA You do now.
Then comes the slow reveal:
CAMERA: SLOW REVEAL – LENA (15) stands in shadow. Hood up. Motionless in the corner.
LENA You do now.
Lena’s voice reintroduces consequence, but only as performance. It’s not morality restored; it’s morality remembered. The moment isn’t ethical – it’s cinematic. The reveal is the moral event.
Her mother, the Gormie in question, is little more than an echo of personhood. The outrage in Lena’s voice belongs not to ethics but to staging: a scene constructed to look like remorse.
The simulacrum here isn’t the Gormie. It’s the moral itself – played out as ritual, devoid of anchor. These children have inherited the gestures of adulthood but none of its meaning. They mimic guilt because that’s what the dead world taught them to do.
By writing the chapter as a film script, Propensity exposes its own mechanism. Every camera move, every cut, is a reminder that you, the reader, are complicit. You’re watching a reconstruction of a reconstruction. The text becomes its own simulacrum – a story imitating cinema imitating life.
Even the bed, ‘a dent in the mattress’, is a metaphor for what remains of the real: an impression where something used to be.
The result isn’t post-apocalyptic horror but philosophical unease. What happens when moral sense survives as empty choreography? When consent and consequence are just old lines, the species keeps rehearsing?
Propensity isn’t about survival. It’s about what comes after survival—when humanity’s operating system still runs, but the data’s corrupted. The characters are trying to rebuild a moral code from cached files.
Simulacra is the point where imitation becomes indistinguishable from intent. It’s a study in ethical entropy, a mirror held up to our own cultural exhaustion, where outrage has become performance and empathy a brand identity.
This is the future Propensity imagines: not a world without humans, but humans without the real.
As an author, reviews matter. Not because they inflate the ego (though I won’t pretend a kind one doesn’t help), but because they’re one of the few moments when the work stops being mine and becomes read.
I submitted Propensity for professional review through Reedsy – why not? It’s always interesting to see how a stranger processes what you’ve made. Some of my books have Kindle editions, which makes collecting feedback easier: I can offer them free for a day or two and watch the downloads climb. Whether those books are ever opened is another question. I’ve been that reader too – downloaded an eBook, nodded at the cover, and forgotten it. I’ve bought audiobooks I’ve never started.
So when someone actually read Propensity, a book not yet available as an eBook, and took the time to write a thoughtful review, that meant something. And unlike the memorable one-star “Garbage” review that Sustenance once earned, this one had a little more nuance.
An unnerving story that begins with a bizarre experiment and unfolds into an impressive hyperbole for human hubris.
Synopsis
What if peace could be engineered?
In Propensity, a team of scientists and a military general pioneer a device capable of altering human behaviour itself—tuning aggression, obedience, libido, faith, and risk tolerance like dials on a console. At first, the results seem miraculous: violence quelled, conflict dissolved, impulses muted. But as the technology scales from labs to battlefields to cities, the illusion of control begins to fracture.
Through sharp, unsettling vignettes, the novel traces both the grand sweep of societal collapse and the intimate struggles of those left to navigate it. At its heart, Propensity is a literary exploration of power, morality, and the fragile myth of free will.
Both speculative and philosophical, it poses an unnerving question: if our choices can be rewritten at the neurochemical level, were they ever truly ours?
– Review Begins –
“Reader discretion is advised. Free will has been deprecated.”
This ominous word of caution is what Ridley Park’s speculative novel ‘Propensity’ opens with, and it sets a tone that strikes an impressive balance between clinically descriptive and quietly devastating. Beginning as a bizarre experiment in behavioural modulation by way of neurochemical intereference, it unfolds into an eerie metaphor for the tricky road between control and conscience.
Park’s chapters are short and succinct, some barely a page long, in a staccato rhythm. This creative choice, while initially a little unnerving, works well to reflect the story’s inherent disintegration: scientists losing grip on their own creation, subjects dissolving into numb submission or what they term “the zeroed state”, and a world slowly learning the price of their “engineered peace”. The writing comes off as crisp in an almost detached manner that leaves one wanting for a bit more emotional depth in the first part of the book but not only does that eventually grow on you, it ends up serving its purpose of thematic execution in both its text and subtext. Phrases like “silence playing dress-up as danger” and “peace was never meant to be built, only remembered” linger like faint echoes long after you turn the page.
This dogged curiosity and thought the writing dredges up anchor the novel’s core strength. Its impact is rooted not in prosaic preaching but letting the reader unpack the implications by themselves as they go on. Working in the field of medical physiology myself, the scientific nitty-gritty delved into, including the hormonal cues and neuronal plasticity, particularly intrigued me and while I acknowledge the convenience of fictitious extrapolation of theory, it manages to add a certain sense of realism to the story. It’s equally fascinating and disturbing, especially in the current epidemic of artifical intelligence we live in, to see faith and empathy become mere variables in a lab.
A fitting hyperbole of human’s hunger for order, ‘Propensity‘ does occasionally falter. Its fragmented and experimental structure, with prose interspersed with poems and memos, while successful in tying up its chaos, sometimes undercuts emotional engagement. The chapters are like snapshots that end before they can fully breathe. But when Park makes it work, especially through the poetic montage that follows the post-modulation disaster, it’s hypnotic.
By the end, I found myself returning to that elusive idea of peace conspicuous throughout the book. The text seems to suggest that peace isn’t something we construct but rather, something we remember. It’s almost a fragile illusion fleeting across one’s reality, often better suited to being a word than a sentiment, history than hope. It’s as if the moment you declare peaceful times, they’re already past.
‘Propensity’, thus, doesn’t offer answers; it offers questions and their ramifications. And in more ways than thought possible through the misconception surrounding the scope of speculative genre, that’s perhaps a truly accurate representation of the times we live in.
– Review Ends –
Why I appreciate this review
It would be easy to say I appreciate it because it’s positive. But that’s not the point.
One of my beta readers—someone I trust implicitly—had the opposite reaction. He loved the first half and thought the latter sections fell apart. This reviewer? The reverse. She found the disintegration satisfying. She saw design in the decay.
That tells me Propensity did what I intended: it divided readers by temperament. It rewards those who stay long enough to realise the structure mirrors the subject—the erosion of coherence itself. I never meant to write a tidy narrative. I meant to write an experiment in entropy.
If your literary diet leans on plot-driven fiction, my work might not taste familiar. I don’t spoon-feed answers. I leave questions open, sometimes maddeningly so. That’s deliberate.
An Anecdote
Years ago, my company ran a focus group for a software interface. Two groups saw the same prototype: one in their twenties, one in their fifties.
“It’s like a video game!”
Both said the same thing—“It’s like a video game.” The twenty-somethings meant it as praise. The fifty-somethings meant it as criticism.
Same words. Opposite meanings.
That’s literature too. Same text, different minds, different appetites. Some readers crave clarity and closure; others prefer complexity and dissonance. The trick is knowing which audience you’re writing for—and not apologising for it.
I write literary speculative fiction. It’s a small, peculiar corner of the bookshelf. But when someone wanders in and gets it, it’s enough.
Chapter 10 of Propensity is a memorandum—fashioned in the style of a… wait for it… memorandum.
It doesn’t advance the plot much. That’s not its job. Like a dead-end corridor in a brutalist government building, it exists for atmosphere. Aesthetic artefact. Light foreshadowing. Bureaucratic texture. You know the type.
The memo comes from a psychologist involved in the Propensity experiment—writing to the study’s director about unexpected side effects. What they describe isn’t quite failure. It’s something stranger: drift, persistence, compulsive symbolism, the return of narrative despite modulation.
A precursor. A warning. And a throwback to a time when language still tried to make sense of things.
This chapter is one of several experimental inserts throughout the novel. I’ll be showcasing each of them here—in principle, if not in full.
I’ve recently released a new book, Propensity. In preparation for the audiobook version, I’ve assembled some material for PDF that doesn’t convey well in an audible format – this image, for example, from Chapter 43.
This image depicts a frantic ink sketch of a woman’s face, wide-eyed and stricken, as if caught in the instant her world unravels. Her features are carved from chaos—lines scribbled in anguish, as though the act of drawing itself were a desperate grasp for meaning.
The PDF is available for free on the dedicated Propensity page.
I’ll be posting content on Propensity as well as some of my other recent and upcoming releases presently.