The book gives an overview of the Battle of the Atlantic from 1939 to its height in 1941-42, plus the slowly emerging Allied victory in 1943-44. It mixes the stratgic overview with personal views from sailors, propaganda men and Navy people, from lower ranks to admirals. Technical developments are treated briefly, as much as they have bearing on the battle itself.
My opinion: based mostly on existing research, but with added personal interviews with participants, this is an excellent introduction overview of the Battle of the Atlantic. Of course 300 pages is on the short side for the longest-running battle of the war, but that just makes it a good introduction, and there is interesting material for people who have read more about it, too. From the densely packed life on a U-boat to the hectic life on an escort in Mid-Atlantic, from the pens of Lorient to the Admiral at Liverpool to the survivor adrift on a raft, this covers a lot in its pages! For further reading I'd recommend Middlebrook's Convoy (on the climactic battle around SC122 and HX229), or the Costello and Blair books cited in the references. 4 1/2 stars!