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Heartbeat (1946)

A young woman escapes from a reform school and finds her way to Paris; where she ends up joining an academy for pickpockets. Tutored by her mentor; she becomes the pride of the academy and is recruited for a special assignment. She must mingle in a high society party and pick the pocket-watch from an influential diplomat; causing him some embarrassment. What complicates things for our young lady is her falling in love with the diplomat.