Checco, an uneducated but self-satisfied fellow from Milan who has always dreamed of becoming a police officer, fails his entrance exam for the third time, and also commented at the oral examination that the reason he wanted to join the police was benefits-in-kind and cronyism. But the young man's connections get him a security-guard job at the Milan Cathedral--but of course he proves to be a living catastrophe. Spotted by Sufien, an Arab terrorist who is preparing an attack against the cathedral, Checco appears to be the perfect sucker. To manipulate him, he sends his charming sister Farah to seduce him.