This well researched book told the stories of submarines and their sailors from the US entry into World War II until the end of the war. Each year was highlighted with tales of ships and their patrols. What I liked was that each chapter was relatively short and there was a lot of photographs and links to other information and resources. There was also extensive back matter. Very well done. This is too bulky for my students (up to 5th grade) but perfect for 7th and up - especially those interested in the war and submarines. Very well done.