Vivement dimanche !

Julien, the director of an estate agency, finds himself under suspicion of a double murder: that of his wife, Marie-Christine, and her lover, Claude. With circumstantial evidence against him, and following a third murder, Julien flees to escape the police. His secretary, Barbara, then decides to conduct her own investigation to uncover the truth. But she soon finds herself caught up in unexpected situations… which are becoming increasingly worrying.