Black Coral: A Thriller (Underwater Investigation Unit Book 2)

Name: Black Coral: A Thriller (Underwater Investigation Unit Book 2)
Price: 5.99 USD
Availability: InStock
Rating: 4.6 (18720 reviews)
Author: Andrew Mayne

by Andrew Mayne

Thriller

4.6 (18,720)

4.6 stars from 18,720 reviews. One of the highest rated Thriller books we track.

321 pages~5.4 hr readPublished by Thomas & MercerPublished 2021-01-01

$5.99At peak price

Last checked: Jan 22, 2026

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

Price history: $1.99 – $5.99

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Price range: $1.99 – $5.99

Buy on Amazon - $5.99

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About this book

Series information taken from www.goodreads.com.

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We track price drops, sale patterns, and predict when this book will go on offer next.

Price History

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

$1.99 – $5.99

Price has dropped 18 times over the last 5 years. Goes on sale roughly every 97 days. Typically stays discounted for 20 days.

Sales Rank

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

Currently around #32K in the Kindle store — a steady mid-list seller. Sales have softened 170% recently.

Rating & Reviews

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

Currently 4.6★ from 18,720 reviews

Gaining approximately 123 new reviews per month. Reader interest is accelerating. Rating has remained stable at 4.6 over the tracking period.

Sale Prediction

Actual Predicted

Based on past patterns, a price drop could happen soon. It typically goes on sale every 97 days and the last drop was 211 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.

Curious how prices and deals move across the whole Kindle store? See the latest findings in The Kindle Report