该片根据Max Porter的小说《Grief is the Thing With Feathers》改编，讲述了一位父亲和他的两个年幼的儿子如何面对妻子和母亲的突然死亡，在试图重建生活的过程中，遭遇了一些神秘的事情。
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.
