Pathfinder Companion: Spymaster's Handbook - Rules of Play says:
Gain the upper hand over your opponents by learning the deep, dark secrets they wish to keep hidden with Pathfinder Player Companion: Spymaster's Handbook. This manual of espionage gives you the tools to disguise your true loyalties, broker illicit information, and attempt stratagems of subterfuge that can change the outcome of an encounter before swords are even drawn!