At 33 years old, and after numerous failed attempt to make it as a musician, Chris still lives with his mother. One day he crosses paths with a young missionary in need of a guitarist for his new religious band, he recruits Chris and disguises him as Father Christophe.

After a successful bank robbery, Micky hopes to take back his girlfriend Marie who has been taken from him. On the way to Paris he meets Leon, a neurotic dreamer whom he considers an idiot. Leon can hardly understand what Micky is up to but he follows him everywhere and soon falls in love with Marie.

Fush and Ballestrat are the heads of each department of the French police. Both have the task of combating serious crime and cleaning up the underworld.