Marseilles police officer Émilien has trouble sleeping at night. He’s obsessed by a gang of bank robbers who disguise themselves as Santa Claus, then evade the police by escaping on shoes that have retractable wheels. The young cop is so obsessed that he doesn’t even notice his girlfriend, Petra, is eight months pregnant. While the investigation is ongoing, police chief Gilbert welcomes Qui, a journalist, who is planning to do a story about the French police force. Meanwhile, the Santa Claus bandits repeat their crime. But this time Daniel, a taxi driver and Émilien’s good friend, helps the police officer to track down the elusive criminals.