Kei is an experienced pickpocket, a ‘sparrow’ in Hong Kong street slang, and he and his three partners make a good living picking the pockets of unsuspecting pedestrians. Kei also enjoys a carefree lifestyle, riding his bicycle through the city to take photos with his vintage Rolleiflex. One day Kei is fascinated as the gorgeous Chun Lei comes into his sights. But Chun Lei is not only a beautiful face, she also has a mysterious past and as Kei and his partners fall for her, one after another, Chun Lei reveals her true intention. The sparrows are to steal a key that is of great importance to her. At first the task seems simple but then another interested party appears on the scene, tycoon Mr Yen.