Bassie and Adriaan have a diamond named after them. Escaped from prison, diamond thieves B1 and B2 attempt to steal it, dressing as Bassie and Adriaan. The actual Bassie and Adriaan are given three days to prove their innocence.

Bassie and Adriaan find themselves abandoned by their own circus because they overslept, and with no tour-schedule in sight or any money they're forced to take other jobs -- losing each one. A malicious 'poltergeist' turns out responsible for their misery.

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.

An unknown man asks Bassie and Adriaan to track down packages throughout Europe. To find the packages they have to solve all kinds of strange riddles. On their quest for the packages they travel through the whole of Europe and discover beautiful and interesting places. What they don't know is that De Baron, Handige Harry and B100 are trying to lure them into an ambush. Thus begins an exciting but beautiful adventure!

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

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.

Bassie and Adriaan take a well-earned holiday but find themselves chased by two diamond thieves, referred to as B1 and B2. The crooks mistake Bassie for the go-between who came to collect the key to the vault of the stolen diamonds.

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.