After coming across a beautiful woman (Kelly Lin), Kei (Simon Yam) and his gang of pickpockets agrees to help her to retrieve something of hers--but this seemingly simple mission quickly gets complicated. Kei (Simon Yam) is an experienced "sparrow". He and his partners make a 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 a dashing beauty, Chun Lei (Kelly Lin), suddenly appears in Kei's viewfinder. The sparrow is mesmerized... But beneath Chun Lei's attractive façade lies s mysterious past. As Kei and his partners fall for her one after another, Chun Lei reveals her true intention: to have the sparrows steal something of great importance to her from Mr. Fu (Lo Hoi Pang), a rich merchant. Rainy day, a decisive fight is coming...