The painter Antonio Berti was called to Reims by his friend Robert Maurisson to restore the paintings of the cathedral. Robert likes young girls, even if he is a famous notable. And precisely, he kills one of them. At the crime scene is also his friend Antonio, who at first does not understand what has just happened and then does not speak because of the friendship which binds him to Robert. But Commissioner Guerin charges him with the offense and Robert asks for time to run away, but..