Serge Graulus and his girl rob fur-maker Isaac Bachmann's workshop at night in his home. When the old man catches him in the act, Serge wrestles his shotgun away and uses it on him, fatally. After the team arrests Alain Steinberg's contraband gang, caught selling the fenced furs, he tips them off so they can trap Serge, but he gets away. An at first sight unrelated jewel case leads to his girl-friend Petra.
