Shadow's Reckoning: Shadow Island Mystery Files (Shadow Island Series Book 20)

Shadow's Reckoning: Shadow Island Mystery Files (Shadow Island Series Book 20)

by Mary Stone

4.7 (4,990)

4.7 stars from 4,990 reviews. Top 50% of Mystery Thriller books we track.


$2.99KU50% off peak

Last checked: May 1, 2026

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Fans of these authors will like this...

  • Tessa Dare
  • Greer Macallister
  • Lisa Jewell

Fans of these books will like this...

  • The Hunting Party
  • The Turn of the Key
  • I Know Who You Are

Perfect for you if...

  • You love crime thrillers where the detective has personal skin in the game and can't stay objective even if they tried.
  • You've read deep into a series and want to see years of setup finally pay off with real consequences and escalating danger.
  • You enjoy protagonists who are hunted, isolated, and forced to think several moves ahead just to survive.

Maybe not for you if...

  • You're new to the Shadow Island series and expect this to work as a standalone. Twenty books in, the character relationships and mythology will feel opaque.
  • You prefer mysteries you can solve yourself alongside the detective, because this is more cat-and-mouse thriller than puzzle box.
  • You want a lighter touch. This book leans into psychological torment and stacking bodies as a form of communication.

About this book

Sheriff Rebecca West responds to a late-night dispatch reporting a fatal car accident on a bridge. The victim is her informant—a man who provided her with a thumb drive containing evidence against someone who destroyed her life. He was traveling to Shadow Island to seek her protection when he died. The strangulation marks on his neck reveal the truth: this was not an accident, but an execution. Rebecca identifies the killer as someone who has systematically silenced opposition, including her parents and an inventor who once worked for him. Now he is targeting Rebecca. Each act of violence serves as a warning, each victim a message. The killer uses murder to make examples. Rebecca must find a way to stop him before she becomes his next target. The stakes involve her survival, and the game between them is underway.

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Price History

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

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Free$3.00$5.99Mar '25May '26
$5.99$5.99

Currently on sale at $2.99 — 50% off peak. Price has dropped 1 time over the last 13 months.

Sales Rank

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

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#61#13,729#27,397Apr '25Sep '25Jan '26Apr '26

Currently around #20K in the Kindle store — a steady mid-list seller. Sales have softened 49% recently.

Rating & Reviews

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

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4.0★4.5★5.0★Apr '25Apr '25Jun '25Apr '26RatingReviews

Currently 4.7★ from 4,990 reviews

Gaining approximately 413 new reviews per month. Reader interest is accelerating. Rating has remained stable at 4.7 over the tracking period.

Sale Prediction

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Free$3.00$5.99Mar '25May '26PredictedMay '26

Actual Predicted

This book is currently discounted at $2.99. It typically returns to around $5.99.

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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Mary Stone

1 book on Vagrant Press

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