A really good one. This is a psychological novel. One of my favorite Simenon's.
After killing his wife and her lover, Herr Schutter, Kuperus escapes suspicion and the townspeople sympathize with the widower for a time. Then he begins behaving extravagantly, flaunting his affair with his housekeeper and scandalizing the crabbed, insular community in other ways. Finally, the doctor has no practice, no friends; he and the housekeeper are prisoners in his house.