Bassie finds a mysterious stone while on holiday in Greece. Three crooks are very interested in the secret the stone holds.

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.

After four centuries of common history, almost 10% of the Dutch have Indonesian roots in their family. The national history is brought to life on the basis of historical stories between the Dutch East-Indies and the city of Amersfoort.

The three crooks lure Bassie and Adriaan to Curacao to take care of them once and for all. This doesn't go as planned. Back in The Netherlands Bassie wins a trip to the USA in a TV quiz and takes Adriaan on a tour of the whole country. What they don't know is that de Baron, B100 and Handige Harry are on their trail.