In the 2012 movie Argo, Ben Affleck portrays Tony Mendez, a C.I.A. operative who singlehandedly rescues six U.S. diplomats from Iran in the weeks following the 1979 seizure of the U.S. embassy. The finale of The Langley Files, the C.I.A.’s new podcast, reveals an astonishing new detail: Mendez had not worked alone, after all. A second agent, Ed Johnson, shared the task of traveling into Tehran, training the stranded ambassadors in their cover identities as members of a Canadian film crew, and shepherding them out of the country. In audio clips lifted from a previously classified interview, Johnson tells the story of the operation from his perspective. Sharing previously unknown details, it’s a thrilling oral history of one of the C.I.A.’s most celebrated missions. —Paulina Prosnitz