"A deadly gun hidden in lipstick, secret messages in invisible ink, a cat fitted with a listening device: which of these were used in undercover operations? Read on and find out! Undercover operations feature some amazing gadgets, but there is more to undercover work than high-tech gizmos. Going undercover is risky and dangerous. Around the world, the armed forces, secret services, police, and other organizations send men and women on hazardous undercover...