Knowledge is power. Kautilya's Gudhapurusha system identifies 9 categories of secret agents: Kapatika (fraudulent disciple), Udasthita (renegade), Grihapatika (householder), Vaidehaka (merchant), Tapasa (ascetic), Satri (assassin), Tikshna (poison expert), Rasada (poisoner), and Bhikshuki (female mendicant). This chapter explores Samstha (agents in disguise), how to recruit and verify agents, counterintelligence, and the ethics of espionage.