Episode 287 is Callan (1967)

"The Good Ones Are All Dead"

Callan's recall from forced retirement, but this time to keep an eye on former SS officer Strauss (Powys Thomas), who is posing as a Greek Cypriot businessman named Stavros. Having secured a position as his bookkeeper, Callan is ordered to keep Strauss alive until he is handed over to the Israelis, and find conclusive evidence of the man's true identity.