Another solid offering from Simenon, the 72nd of 75 Maigret novels, the only indications that he must be getting on a bit being his melancholy when he meets an old colleague's teenage son because he and his wife never had children, & his obliviousness to rock music.
The mystery is handled well, of course, & it's a rather sad & sorry affair, which Maigret approaches somewhat bullishly, if not brutally, until Mme. Maigret gently pricks his humanity.