A woman, Elsa, is brutally murdered in her Amsterdam apartment. Her ex-lover, Martin, is seen outside the building around the time of the crime. The witness who saw him? A policeman. It looks like a straightforward case – but police inspector Van der Valk is not convinced. Despite all the evidence – and the fact that Martin originally denied he was at the apartment – he believes Martin is not guilty of murder. Instead of charging him, Van der Valk takes him on a tour: a tour of the investigation; a tour of Martin’s own past; and a tour into the darkly obsessive world of Elsa.