貝琪並不缺錢,但患有偷竊癖的她總是忍不住對他人的財物出手。她在地鐵上行竊時遇見美麗的鋼琴家米蘭達,並對她一見鍾情。在偷了一名英國警察的皮夾後,貝琪遭到追捕,與警察你追我跑的逃亡路上,卻與米蘭達越走越近。兩人日復一日的相處中,情愫逐漸萌芽,身為偷竊慣犯的她,這次被偷走的竟是自己的心...
Based on the novel by Karel Capek, the prominent Czech writer of the early 20th century who coined the word robot for his play R.U.R., the story revolves around a discovery of Krakatit - a powerful explosive - by Prokop, an experimental scientist who, following an accidental explosion in his lab, slips in and out of delirium. When he realises that, in a delirious period, he has given the formula for making Krakatit to one of his colleagues, he tries to find the man, who does not realize how dangerous a thing Krakatit is. In the process, he nearly gives his discovery away again to foreign interests, a group of anarchists, and even greater forces of darkness...