Maigret knows that he is risking his position by allowing a murder suspect to escape, thereby getting on the trail of the real culprit. The Commissioner is investigating the crime against old Mrs Henderson and her housekeeper, who were stabbed to death in their sleep. Maigret suspects Monsieur Kirby, nephew and heir, but he has a solid alibi. Things get turbulent for Maigret when Heurtin unexpectedly manages to get rid of his guards and the cynical medical student Radek runs into the inspector ... Based on the 9th Maigret novel La tête d'un homme (1931). Published in German as Um eines Mannes Kopf, Maigret riskiert seine Stellung and as Maigret kämpft um den Kopf eines Mannes.