Authoritative factual research (though I have spotted 2 tiny factual errors, one a date and one statistic), elegant prose, the author's own Admiralty background, Roskill is a must and it is good that copies are still around. (so few remain in public librareis--even reference ones). In my view an expert text written c.15 years after the events (as here) is at just the right distance--author not caught up in contemporary bias, but not removed from first hand experience. The maps are excellent. A good set of volumes for a reference library shelf, but ALSO a good, sustaining, read.
This was a good overview of the war at sea, but I found that sometimes it spent more time than I wanted on the US actions. However, I really valued this series of books and learnt a lot from them. In this reprint edition, the reproduction of the maps is very poor. The originals appear to have been done in colour and these black and white versions mean that the old colour lines are faint or missing. As reproductions you will also find the odd hand-written correction. These issues disract somewhat from what are very significant historical narratives. However, for the student of naval warfare they are a "must have".
Quite an old book now (1950s), but it was by the official British naval historian, and is a solid, detailed read, strong on narrative and analysis. It covers such famous events as the Battle of the River Plate, Dunkirk, Crete, and the sinking of the Hood and Bismarck. I still consult my copy even though I have read many detailed individual studies since. Roskill was not allowed to refer to Bletchley Park and "Ultra", but in places one gets a hint that they played a role.
This excellant book tells the offical view of the United Kingdom about its navel operations from the start of World War II to the end of 1941. Well done and essential if you are intewrested in this topic.