The best book on Close Protection Bodyguarding. I think Peter Consterdine has done an excellent job in writing this book. The book covers most subjects regarding Close Protection.
I would also recomend buying the following books: Bodyguarding; A Complete Manual by Burt Rapp
Executive Protection: A Professional's Guide to Bodyguarding by Benny Mares
Bodyguard Manual By Leroy Thompson
Men in black: The bodyguard training manual By Mark Yates
Study books prior to going to any Bodyguard School, This way you go prepared.