Grégoire Lecomte, the unlucky actor anxious to find a "real job", goes to take a screen test for a role of a killer, but gets to mafiosi by mistake. He takes their don for a producer, and they mistake him for a hitman with whom they had an appointment. Deluded Lecomte signs contract with them. He is supposed to kill gun dealer Otto Krampe at his birthday party in Saint-Tropez by piercing him with a cap of the umbrella with a built-in syringe with potassium cyanide. Lecomte is not aware that it has to be a real murder.
Dressed as a clown, the clever rascal Grimm holds up the most secure bank of Montreal and takes 30 hostages. While confusing and ridiculing the police with his strange behavior, he calmly manages to rid the bank of a fortune. But then an unsatisfied companion arouses trouble...
Alexandre Dupré, yakın zamanda öldürülen bir Fransız bilim insanının değerli bir icadını içeren mikrofilmi avlamaya tesadüfen dahil olan bir dolandırıcıdır.
Bir cinayete tanık olan Alphonse, vakayı bildirmek için karakola, müfettiş Morvandieu’nün yanına gittiğinde, cinayetin polisin umrunda olmadığını fark eder. Karısı da cinayete kurban giden Alphonse, onun katiliyle birlik olup suç dünyasına atılır ve müfettiş Morvandieu’yü de ekibe katar.