Inspired by the 1955 movie It Takes A Thief, this series chronicles the adventures of playboy Alexander Mundy. Unknown to the world at large, Mundy is also one of the world's greatest cat burglars The U.S. government eventually caught Mundy but offered him a deal: he would be released from prison and considered under house arrest, but in return he'd have to lend his talents to the SIA and steal from America's enemies.
Mundy was supervised by SIA agent Noah Bain in the first two season (Wally Powers in the third). In the third season he occasionally teamed up with his father Alistair Mundy, a retired cat burglar who taught Alexander everything he knew.