I read this book in January 2020. The book started promisingly, the suicide/murder of the American piqued suspense. But then it went downhill quickly. The sheer implausibility of an American sub commander taking out a Russian submarine is, to say the least, glaring. More impossible is his familiarity with equipment, systems and construction! And then the convenient disablement of the original captain of the Russian sub! If you can suspend your logic for sometime, read this book.