伊森在父母车祸生亡后背负极大的罪恶感，他毅然决然放弃了麻省理工学院的大好前途，为了他的妹妹转而投入一项极具革命性的新实验。伊森在过程中逐渐发现这项实验的无穷潜力，甚至萌生想将死去的父母带回人间的念头，然而结果却超乎他的预期……
The crooks in London know how it works. No one carries guns and no one resists the police. Then a new gang appears that go one better. They dress as police and steal from the crooks. This upset's the natural order of the police/criminal relationship and the police and the crooks join forces to catch the IPOs (Impersonating Police Officers), including an armored car robbery in which the police must help the gangs to set a trap.
