For the benefit of those who have had the pleasure of being taught by the author, this is indeed as engaging as his lecture and seminar work!
This is a wonderful introduction to the magnificent subject of the Medieval Military Orders. Covering the Knights of the Hospital, the Teutonic Order and of course the Templars, this is an in-depth general survey text that offers a comprehensive knowledge of the military orders without slipping the a self-indulgent style of writing many scholars of this subject often lapse into. It is a wonderful study that serves as an excellent opening gambit for the subject, and is thoroughly referenced - it also includes a number of primary sources for our own entertainment.
Highly recommended if you are new to the topic, or, indeed, if you are a specialist looking for a simple overview of the MMOs. 5/5.