This is not a whodunnit, it is more a psychological case study. Van der Valk gets a letter from a prominent banker accusing a well-known doctor – a neurologist - of murdering his tenant, an elderly, alcoholic painter with a penchant for young girls. The painter is buried, no police suspicions at the time of death. The banker wants any investigation to be anonymous so none of the women involved with the painter will be embarrassed. As it turns out, the doctor is a serial womanizer, picking his partners from his patient list, including at one point, the banker’s wife and daughter. The painter’s apartment overlooked the doctor’s courtyard, a perfect spot for spying, and perhaps a bit of blackmail.
Van der Valk presents himself to the doctor as a potential patient, symptoms non-specific, and they begin to interview each other. It is a pretty fascinating duel of wits, the urbane polished doctor versus the slightly scruffy, blunt cop. The second half of the book is in the form of a letter from the doctor to Van der Valk in which he explains his life, his history, his loss of status and prosperity in the colonies, his relationships with women including: his glacial wife, a socialite with artsy pretensions, the wife of the banker, and her daughter.
Dr. Van der Post is quite a character – convinced of his own superiority, yet coming to a grudging sense of Van der Valk as a worthy opponent. The mental duel between the two is stunning in its quiet way.