The Omega Gambit
The paperback of The Omega Gambit is currently ranked 8,388,607 on Amazon.com according to NovelRank's collected data. Published by lulu.com, the book's Amazon sales rank has been tracked for a long time, starting on June 27, 2015. In that time, author David Brown has seen the book peak at a ranking of 10,443,720. However, NovelRank is not actively tracking the sales rank of this book.
You can view charts and see full ranking and sales data across all worldwide Amazon domains by viewing the full detail page on NovelRank.com.