It Takes a Thief (1968)

S1E10 Birds of a Feather

Title: Birds of a Feather Plot: Mundy embarks on a quest to recover a crucial microfilm capsule, navigating through a quirky spy held captive in a communist facility. His journey takes an intriguing turn when he encounters the stunning wife of an ambassador, who possesses a cameo ring inscribed with the word "confidential."