Black Coral: A Thriller (Underwater Investigation Unit Book 2)
by Andrew Mayne
4.6 stars from 18,720 reviews. One of the highest rated Thriller books we track.
Last checked: Jan 22, 2026
Must ReadHighly rated with thousands of reviews. A proven favourite.Full price — consider adding to your watchlist for a better deal.
Price range: $1.99 – $5.99
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About this book
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Price History
Kindle price over time. Green zones = periods when the book was free.
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 166 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.
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