When Maigret's.45 revolver is stolen from his home, he becomes embroiled in a murder in which the gun may have played a deadly role.
Maigret is the victim of a burglary in which the.45 revolver he had received as a gift from the FBI is stolen. That evening Maigret attends a dinner where François Lagrange, an acquaintance of Maigret's friend, is expected but fails to appear due to ill health.
Following his instincts, Maigret decides to investigate Lagrange's absence and uncovers a body stowed in a trunk as well as Lagrange, who refuses to talk and seems to have lost his mind. Only Maigret can uncover the truth, and the fateful role his revolver may have played.
