I of England.
Book reviews are the most common form of academic publication.
For every scholarly work published, there are dozens of different reviews spread through a wide variety of learned journals. This is because scholars find them a useful way of determining what books they should read. A good review should make clear to the reader how they could use the work. This allows your readers to place it in its scholarly context and to determine if the work is of interest to them. Summarize the essential argument of the book.