Killer Smile (Stella Knox FBI Mystery Series Book 1)

Name: Killer Smile (Stella Knox FBI Mystery Series Book 1)
Price: 2.99 USD
Availability: InStock
Rating: 4.4 (17117 reviews)
Author: Mary Stone

by Mary Stone

Mystery Thriller Thriller

4.4 (17,117)

4.4 stars from 17,117 reviews. One of the highest rated Mystery Thriller books we track.

252 pages~4.2 hr readPublished by Mary Stone Publishing

$2.99At peak price

Last checked: Nov 23, 2025

Must ReadHighly rated with thousands of reviews. A proven favourite.

Price history: $0.99 – $3.01

While not the biggest discount we've seen for this book, it's still a great deal and we recommend grabbing it before price returns to its normal range.

Price range: $0.99 – $3.01

Buy on Amazon - $2.99

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Perfect for you if...

You love crime procedurals with a personal edge and want an FBI agent protagonist who's hunting killers while chasing demons of her own
You're drawn to small-town mysteries where the calm surface hides something sinister beneath
You appreciate fast-paced thrillers that don't linger on gore but keep the tension wound tight throughout

Maybe not for you if...

You need romance subplots to stay engaged with a character, as Stella's focus here is purely on the case
You prefer standalones over series and want closure within one book rather than the promise of more to come
You're looking for experimental or literary prose; this is straightforward, plot-driven storytelling

About this book

Special Agent Stella Knox joined the FBI to find the dirty cops responsible for her father's murder. Fresh out of Quantico, her first case involves three teenage boys found dead in a small town outside Nashville, Tennessee. The crime scenes offer few clues—no fingerprints, no DNA—but a smiley face drawn in blood appears near two of the bodies, raising questions about whether the murders are connected. Stella must determine if a single calculating serial killer is responsible or if there are three separate assailants. As she and her team work to stop the threat to Cherry Farms' teenagers, the case becomes increasingly urgent. With more questions than answers, Stella races to identify the killer before another victim falls.

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Price History

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

$0.99 – $3.01

Price has dropped 9 times over the last 4 years. Goes on sale roughly every 135 days.

Sales Rank

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

Currently around #11K in the Kindle store — a steady mid-list seller. Sales have softened 86% recently.

Rating & Reviews

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

Currently 4.4★ from 17,117 reviews

Gaining approximately 236 new reviews per month. Reader interest is accelerating. Rating has remained stable at 4.4 over the tracking period.

Sale Prediction

Actual Predicted

Based on past patterns, a price drop could happen soon. It typically goes on sale every 135 days and the last drop was 195 days ago. Typical discount: 67% 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.