Four amateur detectives, five ruthless friends and a lost painting - the fourth case for the Amsterdam Houseboat Detective Agency.
Old Onno has two problems: A dead man is sitting in his living room, and a painting is missing from his wall. He does not know the man, but the painting is a copy he made of the lost painting "Farbenzauber". As Onno does not want the police to find out about his short and not very successful time as an art forger, he turns to the houseboat detectives first. They find out that the original painting did not sink in a boating accident, but belonged to a famous film director. He recently died, but left five of his friends clues as to the whereabouts of the valuable artwork. And very soon the detectives realise that there are people who would kill for art..
