Great book for the beginner or an old pro. Been reading lock picking books for 35 years and this is one of the best... Deviant Ollam, one of the security industry's best-known lockpicking teachers, has assembled an instructional manual geared specifically toward penetration testers. Unlike other texts on the subject (which tend to be either massive volumes detailing every conceivable style of lock or brief "spy manuals" that only skim the surface) this book is for INFOSEC professionals that need essential, core knowledge of lockpicking and seek the ability to open most locks with relative ease.