A book review is a paper involving an opinion of, and information about, a particular book. It is not a summary, an outline or a précis. It includes a statement of what the author has tried to do and evaluates how well this person has succeeded. It presents evidence to support this evaluation.
The reviewer must have thorough knowledge of the book. This means no superficial, quick reading of the work, but careful reading (usually at least twice). It is also useful to have some knowledge of the subject area gained from other sources, to be familiar with other works by the same author, and to have some biographical information on the author.
Take time to think about what you have read. Do not begin to write the review as soon as you finish reading.