This book gives a detailed account of the development and service histories of the four battleships of the Dunkerque- and Richelieu Classes, not more, not less. Their older cousins - the Courbet- and Provence-Classes - are mentioned only briefly, despite the fact that they underwent major updates in the 1920's and 1930's, and despite the fact that they were still very present in WW II. Their real battle value may have been questionable, but at least one of them fired her guns in anger as late as 1945 so I think they deserved more than the fleeting mention they enjoyed in "French Battleships 1922-1956", the title indicating a broader scope than the one actually attempted by this book.
On the other hand, if someone looks for first-class reference regarding the latest French Battleships, the quadruple-turreted Dunkerque- and Richelieu-classes, he doesn't have to look any farther than to this book. Detailed accounts on both their design history and their actual build are complemented with detailed drawings and a host of technical data, including data on their armament. But this is only one half of the book - the other half is their operational history, including, even if limited, a discussion of the political background which led to tragic events as the "battles" of Mers-el-Kebir, Dakar and Casablanca, and which, more than anything, kept them from playing a major role in the battles of the second world war.
Great pictures and colour drawings complete the book, which is a fitting tribute to France's last battleships and the men who manned them. ("France's Last Battleships", by the way, would have been a better-fitting title than the one actually selected ;-))