I guess anyone that thinks the Crusades can be covered in just over 100 pages might be a little delusional. This book was never meant to be an in-depth study, of course. I would say this could be used as an outline for the Crusades and maybe a guide into which point you may desire to study further
Because of the nature of the subject, you are literally bombarded with dates, characters,and kingdoms.
Read this one first, before you really jump in on in-depth study of these events.