A Man's Head is another of the early Maigret novels, from the bumper crop that appeared in 1931. Like other titles from this period of Simenon's writing career, it's very much evidence of an emerging talent, rather than the fully formed article, which you'd expect in so young a writer.
The story is actually quite pacy and convoluted, but Simenon's strength - even at this early age - was his skill in social observation and the ability to capture the atmosphere of the times with few words. There is a cleverness here, because reading the books almost 80 years on, they still manage to feel contemporary. Nothing about the time and place seems particularly dated, proving that Simenon concentrated on charatcer and mood as much as plot to tell his stories.
Another interesting fact that emerges in this particular story is Maigret is already in his mid-forties, so again, Simenon shows good ability at writing about mature characters. This of course, improved with the later titles, but all the ingredients that came together so brilliantly when the series hit its stride are in evidence here.
Plotwise, it's engaging enough, but it feels a bit rushed at the end, and strands of the story need to be explained by Maigret to the magistrate to bring things to a meaningful conclusion. Overall, an entertaining enough early title in the series.