This is a straightforward run through the history of the Normans. The author makes no outrageous claims for the Normans as a race; he firmly places them as Franks rather than Vikings. The most unusual is perhaps that he identifies the early Plantagenets (Henry II, Richard the Lionheart and, less enthusiastically, John Lackland) as Norman kings. In fact he sees the end of the Norman rule of England and part of France as being to do with the loss of Normandy - and a consequent shift of interest to Acquitane - rather than dynastic change.
There is more emphasis on the Dukes of Normandy/ Kings of England than the Kings of Sicily and Princes of Antioch, but perhaps that is understandable. He is particularly strong on William the Conqueror's father, Robert the Magnificent, and eldest son, Robert Curthose. In fact he is noticeably sympathetic to the latter.
There are oddities of translation, the original was written in French, and the footnotes can be confusing. The big fault is the lack of maps. The original French readership were presumably more familiar with the location and layout of modern French departements than English readers might be.
I would recommend this as complementary to
Normans and Their Myth by R.H.C. Davis which takes a more analytical and less chronological view of the same subject matter and is better illustrated and mapped.