Scorpio (Frontlines: Evolution Book 1)

Name: Scorpio (Frontlines: Evolution Book 1)
Price: 2.49 USD
Availability: InStock
Rating: 4.3 (10894 reviews)
Author: Marko Kloos

by Marko Kloos

Thriller Science Fiction

4.3 (10,894)

4.3 stars from 10,894 reviews. One of the highest rated Thriller books we track.

$2.49KU50% off peak

Last checked: May 5, 2026

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Price history: $2.49 – $4.99

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Price range: $2.49 – $4.99

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Fans of these authors will like this...

James S.A. Corey
N.K. Jemisin
John Scalzi

Fans of these books will like this...

The Expanse series
Ancillary Justice
Old Man's War

Perfect for you if...

You love military science fiction with grounded characters who rely on teamwork and grit rather than tech wizardry.
You want action driven by real consequences and character stakes, not just spectacle.
You appreciate a tough, competent protagonist who happens to be female without it being the whole point of the story.

Maybe not for you if...

You need romance as a central plot thread; this is survival and combat focused.
You prefer faster pacing; world-building and colony logistics matter here.
You want standalone novels; this is book one of a series with threads that don't resolve.

About this book

Eight years after an alien invasion forced a small group of settlers underground, a colony survives through communal effort and salvage runs on a distant Earth colony. Alex Archer works as a dog handler, caring for Ash, a black shepherd trained to sense threats, which provides comfort in the harsh off-world environment. The fragile coexistence with the alien species known as the Lankies is disrupted when a salvage operation fails catastrophically, drawing the creatures toward the human settlement. With rescue no longer possible, Alex and her close-knit crew of soldiers, techs, and friends face an uncertain future, confronted by dangers that extend far beyond their initial survival.

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Price History

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

$2.49 – $4.99

Currently on sale at $2.49 — 50% off peak. Price has dropped 9 times over the last 3 years. Goes on sale roughly every 93 days.

Sales Rank

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

Currently around #18K in the Kindle store — a steady mid-list seller. Sales have softened 113% recently.

Rating & Reviews

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

Currently 4.3★ from 10,894 reviews

Gaining approximately 380 new reviews per month. Reader interest is accelerating. Rating has climbed from 4.0 to 4.3. Recent readers are rating it higher.

Sale Prediction

Actual Predicted

This book is currently discounted at $2.49. It typically returns to around $4.99.

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.