While investigating a high-stakes jewel theft, Inspector DeKok is called to check out the death of a clown found floating in a raft down the canal, an enormous knife protruding from its back.

Without the slightest trace, a unique, antique jewel collection disappears from a house along the Gentlemen’s Canal. As DeKok begins the investigation his assistant, Vledder, receives a call regarding a dead clown at the foot of Crier’s Tower. The connection of the crimes initially eludes him, but DeKok’s profession, his calling, pushes him towards the answer.