Without the slightest trace, an antique jewel collection disappears from a house along one of the great canals in Amsterdam. Inspector DeKok feels compelled to help the victim of the theft, unknowingly signing up for a homicide case, as well.

Soon after commencing his investigation into the robbery, DeKok and his partner Vledder are called to the foot of The Criers' Tower. A clown lies dead along the canal with a large, shining knife protruding from his back, creating a blossom of blood around the murder weapon.

After interviewing the clown's variety troupe members, DeKok stumbles upon a connection between the two crimes…