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A beautiful former criminal named Modesty (Monica Vitti) decides to go straight and so begins working for the Secret Service, which sends her to infiltrate a ring of jewel thieves. But soon after she joins the gang, dangerous head crook Gabriel (Dirk Bogarde) grows suspicious of his new recruit, and Modesty realizes that British Intelligence gave her a mission she wasn't meant to survive. She then enlists her former partner in crime, Willie (Terence Stamp), to help her outwit both sides. Wikipedia