Anne Desbarèdes is a young woman who is married to a wealthy businessman and is living a monotonous existence in the town of Blaye, a small commune. After being an indirect witness to a murder which happened in a café, she goes back to it the next day, where she meets Chauvin, who informs her in more detail about the crime scene events. Anna due to her unstable mental balance starts to think that he intends to kill her.