The Twenty: A Thriller

Name: The Twenty: A Thriller
Price: 14.99 USD
Availability: InStock
Rating: 4.4 (1360 reviews)
Author: Sam Holland

by Sam Holland

Mystery Thriller Thriller

4.4 (1,360)

4.4 stars from 1,360 reviews. Top 86% of Mystery Thriller books we track.

$14.99At peak price

Last checked: May 15, 2026

Price history: $1.99 – $14.99

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Price range: $1.99 – $14.99

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Perfect for you if...

You love serial killer thrillers with genuine psychological depth, where the killer's logic is as chilling as their violence.
You're gripped by detective procedurals that interweave past and present cases, forcing protagonists to confront their own ghosts.
You want your crime fiction unflinching and brutal, not toned down for comfort.

Maybe not for you if...

You prefer cosy mysteries or procedurals where the violence happens off-page.
You need sympathetic protagonists or moral clarity; this book's detective work is messy and the stakes are personal.
You're sensitive to graphic depictions of serial murder; Holland doesn't spare you the details.

About this book

A serial killer thriller loosely based on the real-life Smiley Face Killer. When DCI Adam Bishop arrives at a crime scene, he discovers a body marked with a spray-painted number. As more bodies surface, the numbers reveal a horrifying pattern: the killer is counting down to an unknown endpoint. Dr. Romilly Cole arrives at Adam's door with evidence linking these murders to a series of killings from twenty-five years earlier—a case connected to her own past. The investigation becomes personal, and the stakes escalate as the countdown continues. This is Sam Holland's second serial killer novel, following her debut The Echo Man.

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Price History

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

$1.99 – $14.99

Price has dropped 5 times over the last 4 years. Goes on sale roughly every 223 days. Typically stays discounted for 1 day.

Sales Rank

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

Currently around #10K in the Kindle store — a steady mid-list seller.

Rating & Reviews

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

Currently 4.4★ from 1,360 reviews

Gaining approximately 39 new reviews per month. Steady word of mouth growth. Rating has climbed from 4.3 to 4.4. Recent readers are rating it higher.

Sale Prediction

Actual Predicted

This book goes on sale roughly every 223 days. Next drop estimated in about 29 weeks. Typical discount: 87% off.

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.