影片以日记的形式呈现。无所事事的年轻人米歇尔（马丁·拉萨尔 Martin LaSalle 饰）在赛马场目睹了一个小偷偷窃的全过程，他被小偷那自信优雅的手法所吸引遂即加入了偷窃的勾当。爱读书，坚持虚无主义哲学思想的米歇尔坚信偷窃是一种手指的芭蕾，一场完美的行窃就像一场精彩的行为艺术。米歇尔有一个久违的病重的母亲，在去探望的时候结识了一直照顾他母亲的邻居珍妮（玛莉卡·格林 Marika Green 饰），漂亮的珍妮唤醒了米歇尔心中沉睡已久的感情。米歇尔被警察盯住了，警长虽然三番五次的给了他改过自新的机会，但米歇尔依旧沉迷于他的“艺术”中无法自拔，很快，米歇尔被捕了。 　　珍妮来狱中探望米歇尔，她向他袒露了自己的真情，米歇尔在泪水中猛然醒悟，当生命中还有所爱的人存在，生活就不会是一片虚无。Michel takes up picking pockets as a hobby, and is arrested almost immediately, giving him the chance to reflect on the morality of crime. After his release, though, his mother dies, and he rejects the support of friends Jeanne and Jacques in favour of returning to pickpocketing (after taking lessons from an expert), because he realises that it's the only way he can express himself...