If you're looking for FvM action in "It Takes a Thief", this is the very best episode. S2E24, entitled "38-23-36", which takes place at an international beauty contest with Al Mundy (Robert Wagner) pretending to be a photographer. The climactic moment comes at around 46 minutes, when Al goes into Miss Greece's room while she's sleeping, knowing it's she who is holding the microdot he seeks. But there's plenty of lead up to this climax about 10 minutes earlier.
Enjoy.
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