Buy the book to save the cover. It display a German U-Boat. There's a partial photo of a submarine on the back page. And, each chapter is signaled with a small image of a submarine. So, it's about a submarine, right? Wrong. The only boat in the book is a German E-Boat. The cover designer didn't know the difference between a German U- and an E-boat! :-} One has to wonder how this got past the proof readers!! Meanwhile, the story is fair, but in places it leaves the reader saying, "Naw, that wouldn't happen."