An elderly lady who believes someone is trying to poison her, an anonymous caller who feels pursued by strangers. There are days when the crazies seem to appear in droves. But is the caller really insane? Time and again, the man contacts Maigret. Until suddenly there is silence. Later that same night, his body is found at Place de la Concorde. And it doesn't end with just one dead. Maigret's 29th case takes place in Paris and in Charenton-le-Pont, southeast of the French capital.