Rori the Coffee Robot is the brainchild of Clara, who asked her father, Professor Dave, to create a robot that could make coffee. However, despite his efforts, Professor Dave was unable to complete the robot and eventually discarded it.
The Baron and his cronies steal a precious crown and hide in a secret room of an abandoned castle. With the help of their tiny robot Robin, Bassie and Adriaan set out to find the crown and return it to the museum.
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.
Bassie finds a treasure map in a painting he bought at a flea market. Three crooks are also after the treasure and try to take the map from our friends.