De Cock and Vledder investigate the robbery of an armored truck which leads to several murders.

Gifted but hot-headed sculptor Eric has a stormy, erotic, and star-crossed romance with a beautiful young woman named Olga.

Professor Archibald Chagrijn exposes the world to his blubbering gas, which makes people sad and causes them to cry. Bassie proves immune to the blubbering gas -- as he has had an overdose of laughing gas. The professor is hiding on the Canary Islands, but Bassie and Adriaan manage to track him down.