This book details the early adventures of one Dirk Darling. It describes his methods for dealing with traps and bluffing your way out of trouble.
The book is good enough to function as a masterwork tool for sleight of hand, disable device, and bluff; but only gives a +1 circumstance bonus to those skills instead of +2. This bonus stacks with masterwork thieves tools however.
This book is extremely rare and not sold in stores.