Undercover Billionaire: Benson Billionaires

Name: Undercover Billionaire: Benson Billionaires
Price: 2.49 USD
Availability: InStock
Rating: 4.6 (1918 reviews)
Author: Erin Swann

by Erin Swann

Romance Thriller

4.6 (1,918)

4.6 stars from 1,918 reviews. Top 81% of Romance books we track.

$2.49KU50% off peak

Last checked: Jul 2, 2026

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Price history: $0.99 – $4.99

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Price range: $0.99 – $4.99

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It Ends with Us
The Deal

Perfect for you if...

You enjoy romantic suspense where the external threat (the killer) is just as compelling as the internal one (the forbidden attraction).
You like enemies-to-lovers dynamics that feel earned, with real family baggage and past wounds that need untangling.
You appreciate strong female characters who aren't just waiting to be rescued, and complicated male leads with their own reasons for being guarded.

Maybe not for you if...

You prefer standalone romances with no series context, as this is the fourth Benson Billionaires book and references earlier family dynamics.
You want your romantic tension without the heavy thriller elements. The serial killer plot runs throughout, not just in the background.
You're looking for a lighter, low-stakes romance. This one hinges on real danger and the heroine genuinely questioning her loyalty to family.

About this book

Kelly receives a threatening note demanding her cooperation or she will die. When she requests FBI protection, she learns her bodyguard will be Adam Cartwright—a member of a family that has long been at war with hers. To keep her safe, Adam will pose as her boyfriend, a deception that could have serious consequences if her family discovers it. As they spend time together, Kelly finds Adam is not the person she expected, and she begins to develop feelings for him despite the family conflict. Adam joined the FBI to make a difference rather than rely on his wealth. He is assigned to protect Kelly during an investigation into SMK, the Smithsonian Museum Killer. Learning Kelly's identity complicates the assignment—years ago, her brother damaged Adam's future. Forced into close proximity, Adam and Kelly experience mutual attraction and begin to question long-held beliefs about each other and their families. Undercover Billionaire is a standalone novel and the fourth book in the Benson Billionaire romantic suspense series.

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Price History

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

$0.99 – $4.99

Currently on sale at $2.49 — 50% off peak. Price has dropped 3 times over the last 5 years. Goes on sale roughly every 214 days.

Sales Rank

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

Currently around #41K in the Kindle store — a steady mid-list seller. Climbing the charts — 40% improvement recently.

Rating & Reviews

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

Currently 4.6★ from 1,918 reviews

Gaining approximately 21 new reviews per month. Steady word of mouth growth. Rating has remained stable at 4.6 over the tracking period.

Sale Prediction

Actual Predicted

This book is currently discounted at $2.49. It typically returns to around $4.99.

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.