Martin Moone is a young boy who relies on the help of his imaginary friend Sean to deal with the quandaries of life in a wacky small-town Irish family in the 1980's.

迈克尔（希里安•墨菲 Cillian Murphy 饰）是一个不学无术，整天游手好闲的青年，他欠了达伦（布莱丹•格里森 Brendan Gleeson 饰）一大笔钱无力偿还，糟糕的是，达伦是当地最臭名昭著的黑帮头头。布兰达（茱蒂•惠特克 Jodie Whittaker 饰）是迈克尔的朋友，在一场意外中，她误杀了达伦手下的一个小喽啰，巧合的是，迈克尔的父亲吉姆（吉姆•布劳德本特 Jim Broadbent 饰）刚好出现在凶杀现场，成为了目击证人，三人为了躲避达伦的追杀不得不踏上了逃亡的旅途。
父亲难产而又固执的性格，布兰达脸上永远愁云惨淡的表情，接二连三的麻烦和意外简直要将迈克尔给逼疯。

Rats is released from prison and needs to make some money; fast. To his dismay, things have changed dramatically during his absence; his mother no longer has time for him and his ex-bandmates alike. He wishes to help donate towards his obese aunty's trip to Lourdes. He struggles to find a job, yet never fails to find himself in a difficult situation.