NUMB3RS: Con Job

Don and David get in touch with John Buckley, a criminal mastermind whose heists are being copied by an armed gang. When a hit at a diamond exchange in Los Angeles takes place, the agents ask John for help and he agrees in exchange for a reduction in his sentence. Don and the team accept his terms, but as the robbers manage to escape and their man is kidnapped, they begin to suspect they have been conned. Guest starring Fisher Stevens, with David Krumholtz