In Paris, a girl as a favor to her roommate Yvonne, Al's contact, meets Al at the airport. He poses as the girl's fiancée, a stockbroker. When they go to meet Yvonne, she's already dead. Al has to find a codebook, the method of transmission and Yvonne's killer. The S.I.A. suspects the codes are being transmitted during fashion shows at Maison Trion.
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Ready to Watch It Takes a Thief , Season 3, Episode 15?