A Merciful Promise (Mercy Kilpatrick Book 6)

A Merciful Promise (Mercy Kilpatrick Book 6)

by Kendra Elliot

4.6 (32,657)

4.6 stars from 32,657 reviews. One of the highest rated Mystery Thriller books we track.


$2.99KU50% off peak

Last checked: Jun 7, 2026

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Fans of these authors will like this...

  • Tess Gerritsen
  • Lisa Gardner
  • Karen Robards

Fans of these books will like this...

  • The Hunting Party
  • A Good Girl's Guide to Murder
  • The Chain

Perfect for you if...

  • You love high-stakes undercover operations where the protagonist has everything to lose and nowhere to call for backup.
  • You've read the earlier Mercy Kilpatrick books and want to see her most dangerous assignment yet.
  • You enjoy dual-timeline tension: one character undercover while another hunts a serial killer without knowing the real threat.

Maybe not for you if...

  • You prefer your thrillers light on procedural detail and don't want to follow FBI protocol and militia tradecraft.
  • You need your protagonists to have regular communication with allies; isolation plots frustrate rather than thrill you.
  • You're looking for a standalone; this is book six in a series and assumes familiarity with Mercy's background and relationships.

About this book

Mercy Kilpatrick, an FBI agent, goes undercover to infiltrate a militia stockpiling illegal firearms in an isolated forest community in Oregon. Her background among survivalists makes her suited for the assignment. She must maintain her cover by following strict rules, staying inconspicuous, and cutting off all outside contact. While Mercy operates in the winter hills, a separate crisis unfolds. Truman Daly, the police chief of Eagle's Nest and Mercy's fiancé, investigates a series of murders—three men found in different locations, each killed execution-style. Trapped within a group where suspicion runs deep and betrayal carries severe consequences, Mercy has no way to communicate with the outside world or seek help. As the militia's plans for a catastrophic terrorist attack move forward, stopping them may prove impossible, even at the cost of her own life.

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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 '21Feb '23Jul '24Oct '25
$1.99$5.99

Currently on sale at $2.99 — 50% off peak. Price has dropped 15 times over the last 5 years. Goes on sale roughly every 130 days.

Sales Rank

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

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#792#16,375#31,957May '18Sep '23Nov '24Jun '26

Currently #4,667 in the Kindle store — a top-10K bestseller.

Rating & Reviews

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

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4.0★4.5★5.0★May '23Dec '23Jul '24Feb '26RatingReviews

Currently 4.6★ from 32,657 reviews

Gaining approximately 249 new reviews per month. Reader interest is accelerating. Rating has dipped slightly from 4.7 to 4.6.

Sale Prediction

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Free$3.00$5.99Mar '21Feb '23Jul '24Oct '25PredictedJun '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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Kendra Elliot

1 book on Vagrant Press

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