Activation Degradation: A Novel

Activation Degradation: A Novel

by Marina J. Lostetter

4.2 (353)

4.2 stars from 353 reviews


$2.99KU79% off peak

Last checked: May 17, 2026

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Price history: $1.99 $13.99

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Fans of these authors will like this...

  • Ted Chiang
  • Ann Leckie
  • James S.A. Corey

Fans of these books will like this...

  • The Expanse: Leviathan Wakes
  • Ancillary Justice
  • Blindsight

Perfect for you if...

  • You want hard science fiction that takes artificial consciousness seriously, with genuine uncertainty about what's real versus programmed.
  • You enjoy stories where the protagonist's perspective is unreliable because they're literally being fed false data by their creators.
  • You're drawn to space opera with biological engineering and high-stakes military conflict, but grounded in rigorous worldbuilding.

Maybe not for you if...

  • You prefer human protagonists and find it hard to connect emotionally with non-human characters.
  • You want clear moral answers. Unit Four's situation is murky, and the novel doesn't rush to resolve that ambiguity.
  • You're looking for a fast-paced action romp. This is deliberately paced to explore the robot's growing confusion and self-awareness.

About this book

Unit Four is a biological soft robot built and stored above Jupiter's atmosphere. When activated for the first time, it faces an immediate crisis: aliens are attacking the Helium-three mine it was designed to protect, and it must defend Earth's largest energy resource through ship-to-ship combat. However, Unit Four experiences anomalies. Its databanks contain files it cannot account for, unusual chemical combinations flow through its systems, and its information about the aliens is surprisingly limited. Programmed to seek and destroy, Unit Four follows its handler's orders without question. When Unit Four launches its ship to attack, it becomes entangled in a spiral of misinformation, reprogramming, and interstellar conflict. As it carries out its directives, the robot begins to develop sentience and evolve beyond its original programming as a simple tool.

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Price History

Kindle price over time. Green zones = periods when the book was free.

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Free$7.00$13.99Jan '21Jul '23Nov '24Dec '25
$1.99$13.99

Currently on sale at $2.99 — 79% off peak. Price has dropped 13 times over the last 5 years. Goes on sale roughly every 132 days. Typically stays discounted for 21 days.

Sales Rank

Amazon sales rank: lower number = better selling book. #1 is the bestseller.

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#352#535,617#1,070,882Jan '21Mar '22Nov '22May '26

Currently around #498K in the Kindle store — a niche title. Sales have softened 22% recently.

Rating & Reviews

Purple line = star rating over time. Blue area = total review count growth.

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3.5★4.3★5.0★Jun '23Mar '24May '25Mar '26May '26RatingReviews

Currently 4.2★ from 353 reviews

Gaining approximately 3 new reviews per month. Rating has climbed from 4.1 to 4.2. Recent readers are rating it higher.

Sale Prediction

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Free$7.00$13.99Jan '21Jul '23Nov '24Dec '25PredictedMay '26

Actual Predicted

This book is currently discounted at $2.99. It typically returns to around $13.99.

Prices shown in USD from Amazon US. We continuously pull new data to improve tracking. If dates look old, it usually means there has been no significant change since the last data point.

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Marina J. Lostetter

1 book on Vagrant Press

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