Paris 1942. François Mercier is an ordinary man who only aspires to start a family with the woman he loves, Blanche. He is also the employee of a talented jeweler, Mr. Haffmann. But faced with the German occupation, the two men will have no other choice but to conclude an agreement whose consequences, over the months, will upset the fate of our three characters.
One day, Jean-Louis discovers that his heart has stopped. He is not dead, can walk and talk, but his heart is no longer beating. With the help of his wife and a friend, he tries to understand the origin of this mystery.