Henry Pasquier (Pierre Mingand), the spoiled son of a wealthy doctor, discovers high-octane thrills, jazz-era romance and a sense of purpose in life when he unwittingly falls into the company of an organized ring of car thieves. After befriending Jean (Raymond Galle), a dapper young chap with a curious fetish for men's neckties, Henry falls in love with Jeans sister Jeannette (Danielle Darrieux), who works as car-bait for the gang, luring love-hungry Parisian gentlemen away from their chrome-plated carriages.