Propensity Kindle Promotion – Limited-Time Offer

1–2 minutes

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.

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.

Video: 37-second Propensity Trailer – Act I

Audiobook: Propensity Excerpt: Section I – Implementation, Chapter 1: Calibration

Have any more questions? Visit the dedicated product page.

I feel I’ve stuffed this page, so it’s time to go.

Barely Audible

So this happened. I submitted Hemo Sapiens: Awakening as an audiobook, and it was rejected. The site says that they’ll let me know why in a couple days. My question is: if you rejected it, don’t you immediately know why?

I think I know why, but I can’t ‘fix’ the problem if I don’t know what it is. I don’t want to act on an assumption.

I believe they’ll inform me that I can’t use AI-generated narration. This would be odd because they have a programme in Beta where they provide the service of automatically converting the text of a book to audio. To be honest, it doesn’t sound amazing. It appears that they are using their own Amazon Polly, which I like, but you need to babysit it hard. It is very unlikely to sound good without heavy hand-holding. As it is, I hand-held my ElevenLabs AI to make the outcome sound like a professional human.

Audible offers some voiceover actors, but I didn’t like any of them, and they couldn’t compete with my ElevenLabs voice. I can understand that they don’t want to sell audiobooks that sound like Stephen Hawking, but theirs sound closer to him than mine.

On another note, I had to render and upload square cover art. There was a stated restriction disallowing padding a rectangular cover image with space or colour to make it square. I followed this rule, but this is exactly what they do. They take the cover of the book you’re selling through Amazon, and they pad the left and right margins with filler colour. I may append the rationale they provide once I’ve received it. Until them, my audiobook is on hold.

Thanks to India

I’d like to thank the person in India who earned me $0.02 by reading 17 Kindle pages of Hemo Sapiens: Awakening. Reading on Kindle Unlimited is free—time aside. Read the whole book, and I’ve earned $0.50. In time, we’ll be as rich as astronauts.