It Takes a Thief (1968)

Season 2: Episode 10

Al must steal a document hidden in a scientific paper at a conference in Rome. The SIA doesn't know which of the 100 papers contains the document. Al deduces that the paper will be handled by a high-value fence, Grobo, and schemes to get on his good side by stealing the Kimberly Diamond and having Grobo fence it for him. Al comes up with a unique solution to obtain the key paper before it's delivered to Grobo, while also keeping the diamond (that the SIA returns).