Hex (Sentinel Security Book 6)

Hex (Sentinel Security Book 6)

by Hackett, Anna

4.7 (5,600)

4.7 stars from 5,600 reviews. One of the highest rated Romance books we track.

Published by Anna Hackett

$3.99At peak price

Last checked: Apr 24, 2026

Must ReadHighly rated with thousands of reviews. A proven favourite.
Price history: $3.99 $3.99

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Price range: $3.99 $3.99

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Fans of these authors will like this...

  • Neon Blake
  • Tessa Bailey
  • Suzanne Brockmann

Fans of these books will like this...

  • Into the Crossfire
  • The Protectors
  • Heated Pursuit

Perfect for you if...

  • You love spy thrillers with genuine romantic tension that doesn't overshadow the plot.
  • You're drawn to clever heroines who solve problems with brains rather than just brawn.
  • You enjoy series books where you already know and care about the supporting cast.

Maybe not for you if...

  • You prefer romance where the relationship is the main event, not the mission.
  • You want slow-burn chemistry that develops over time rather than immediate sparks.
  • You're looking for standalone books rather than part of a longer series.

About this book

Hex is a skilled hacker who works for Sentinel Security, providing her team with information and communication channels. She prefers her technical work to fieldwork, though she sometimes wishes she had better luck with relationships—particularly with Shade, an undercover operative she finds both attractive and irritating. Shade, whose real name is Cain, is a dedicated spy who works dangerous missions in service to his country. He has no personal attachments and lives only for his assignments. When he needs Hex's expertise for a critical operation, the two must work together undercover to prevent advanced drone plans from falling into enemy hands. As they collaborate, evade danger, and confront criminals, the attraction between them intensifies. For the first time, Cain finds that another person matters more to him than his mission.

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Price History

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

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Free$2.00$3.99Jul '23Mar '26Apr '26
$3.99$3.99

Price has been stable at $3.99 for 3 years. This book rarely goes on sale.

Sales Rank

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

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#16#13,512#27,007Jul '23Jan '24Sep '25Apr '26

Currently around #27K in the Kindle store — a steady mid-list seller. Sales have softened 59% 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★Jul '23Jul '23Feb '25Feb '25Jan '26RatingReviews

Currently 4.7★ from 5,600 reviews

Review activity has been quiet recently. Rating has dipped slightly from 5.0 to 4.7.

Sale Prediction

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Free$2.00$3.99Jul '23Mar '26Apr '26PredictedApr '26

Actual Predicted

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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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Hackett, Anna

2 books on Vagrant Press

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