Jojo’s ambition is to become a gangster but to be admitted into a gang he has to prove himself by committing a daring act. To that end, he kills someone in broad daylight, not knowing that his victim is an actor who is playing a scene in a film. The murder is caught on film, leading Commissaire Bernard to think that the killer will be easy to find. Sure enough, Bernard soon makes his arrest, a clown from a circus, but then he faces an almost insurmountable problem. The clown has an identical twin, who is also a clown with the same circus. Both men claim to be innocent...