Maria van Buren, a beautiful, high-class prostitute, is found dead with a knife in her back in her houseboat on an Amsterdam canal. Grijpstra and DeGier must solve the murder. Her regular clients all have sound alibis and before the murderer is caught the detectives and their commissaries will investigate allegations of black magic, travel to Curacao and pursue their clues to a chilly island off the coast of Holland. He is doing what Simenon might...