When a French man is accused of murder in Finland and he refuses to talk unless to a French police, Inspector Maigret is once again forced to travel to Finland to investigate the case.
Four serial murders in the Marais district of Paris. Maigret sets a trap. Pretending to have arrested the assassin, he sends trained plainclothes policewomen out at night as bait. Maigret hopes that the killer's pride will force him to act.