A complex murder story, in an isolated countryside where deceit and greed are staged. Maigret questioned a mysterious Danish number of hours, Carl Andersen, and he did not plead guilty. Why would the body of a diamond dealer show up at his house? He is innocent or a liar. What does his beautiful but fragile sister know? What makes everyone at the Sanwu intersection so mysterious? Maigret is going to find his killer.