When a man confesses to the double murder of his wife and her lover it seems an open and shut case; but as one part after another of the man's story doesn't check out, van der Valk realizes he is dealing with something far more complicated.

A man is found dead in his room above a sleazy bar and brothel. Van der Valk is called in when the examining doctor suspects poisoning. Immediately sensing there is more to the case than meets the eye, he uncovers a complicated web involving drug dealing and the grubbier end of Amsterdam's S & M industry. Ultimately though, he finds the motive for the man's murder may lay elsewhere and that ""Destroying Angel"" is definitely involved; but who, or what, is that?

When Jan Servaas, a world famous Dutch violinist, makes a rare concert appearance in his home country it is an eagerly awaited event. In the weeks leading up to the concert van der Valk receives a series of mysterious notes, written on blue paper, warning that Servaas will be ""executed"" if he comes to Amsterdam. Van der Valk ignores Kroon's pleas to have the concert canceled until the case is solved, perhaps in part because he and Arlette have tickets and are looking forward to it! It is a decision that will have tragic consequences as a drama which began with betrayal in wartime Limburg plays out to a fatal conclusion in 1970s Amsterdam.

Officers investigating a hearse abandoned near the Royal Palace make a bizarre discovery which appears to be a threat against Paul Harkemer, well known editor of a right wing magazine, and/or his 19 year old daughter. At first it appears that it may be nothing more than a publicity stunt for the left wing rock band Emerald Scorpion, and Harkemer himself seems totally unconcerned. The case seems to over before it started, but then the police receive a cassette tape from someone claiming to be the kidnapper of Harkemer's daughter.

A body dredged up from a canal is tentatively identified as the son of a British MP, but when she views the body she says it is not her son. Van der Valk refuses to believe this and calls on his British colleagues to help prove the boy's identity. The boy's face is well known in Amsterdam's transvestite and transexual scene and van der Valk's inquiries there lead him deeper and deeper into a dark world of sexual depravity and exploitation involving some of the most prominent public figures in Europe. Samson of course desperately advises him to proceed with extreme caution. In the face of the mother's refusal to co-operate van der Valk finds his best hope is to look elsewhere in the family for help.

Why would German Wolf Gebhadrt decide, in middle age, to take up an apprenticeship in stonemasonry in Amsterdam? Why would a man killed in a car accident be carrying a newspaper cutting with a photo of Gebhardt? Van der Valk senses that Gebhardt is in danger and even attempts to have him taken into protective custody when he refuses to co-operate with inquiries. Short on options, van der Valk makes a fatal misjudgement before he finally unravels this complex and frustrating case.

Van Teeseling, a wealthy and influential banker, is found unconscious in his car on the beach. He tells police that the night before he and his wife went for a drunken midnight swim. His wife drowned while he barely escaped with his life. Van der Valk's nose is twitching, but he is put under pressure not to pursue the case. When Kroon discovers than van Teeseling is a former Olympic swimmer, van der Valk is convinced that he staged the incident to get rid of his wife. Van der Valk is determined to use any means to ensure that justice is done.

A dead man appears on a canal barge.

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A private detective is stabbed to death.

A visiting American fears for the safety of her lover who has gone missing.

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A search for a missing teenager finds her tycoon brother unwilling to help.