The book is a comparative historiography of the two, with snippets of their actions and interactions. Apart from their major works it covers their rivalry in researching and publicising naval history. I "saw" the end of this in the various short stories released by both in the late 60s/early 70's. Both had a great influence on getting info out of the RN Historical Branch - something that is now almost impossible.
Although interesting I doubt if many here would find it fascinating except as a study of personalities or how historical writing developed.