It wasn't a traditional painter's smock that Madame Jonker was wearing. It was more a Dominican's monk's habit, the fabric as thick and soft as a bathrobe...She was holding a palette in her left hand, a brush in her right, and her black eyes lighted on Maigret with curiosity.

During an undercover case Inspector Lognon is shot in a room he was sharing with a beautiful woman who has since disappeared. Inspector Maigret retraces Lognon's secretive last few days and is drawn into the darker side of the art world.