Mission: Impossible (1966) : 7x4

Syndicate boss Mike Apollo was being infiltrator by a Federal agent, Parnell, who disappeared - the IMF assumes Apollo is torturing him for information. The IMF must learn where Parnell is. Since fellow Syndicate boss Joe Epic's wife Leona died under mysterious circumstances while Apollo was elsewhere with Parnell, Jim as an insurance investigator reopens the case and hints to Epic his wife was involved with an affair. The IMF plants evidence the affair was with a fellow Syndicate boss, Apollo himself. Jim leaks a fake story to Epic's secretary that Epic is planning to kill Apollo. When Epic accuses Apollo of killing his wife at a Syndicate meeting Jim tells a different story, that it could have been Leona's husband or lover. To clear himself Apollo produces the imprisoned Parnell, at which point the police move in and arrest everyone.