Arnold is convinced that he will become a star during two weeks of musical camp. But to his horror, it turns out that his parents did not drop him off at a musical but at a nature camp. Arnold wants to rectify this misunderstanding as soon as possible
Marietje discovers a sick squirrel and is determined to make her better. Jonathan finds this irresponsible behavior and betrays Marietje to the leaders, who bring the animal back to the forest.
The tough Hassan has become afraid of the horror story that Marietje tells at the campfire. He does everything he can to not show this, but when a mysterious thief is in the camp, Hassan becomes convinced that the horror story has become reality.
As a true animal lover, Suus is very much looking forward to the day activity 'catching aquatic animals.' But when it turns out that they are going to do this in swimsuits, she doesn't dare anymore. She feels too fat. In her attempt to keep her body covered, she inadvertently puts herself out of the group.
Jonathan decides to open a therapy practice because he's convinced that everyone is "Cookie Lokie" except himself. What the other children don't know is that Jonathan is hiding a big secret from them, which he is very ashamed of.
Famke has claimed the caravan for herself and finally has her own place to sleep. But then she gets the shock of her life: she finds blood in her underpants.
Hassan finds it strange that Frans is now sleeping in the girls' log cabin. Is Frans actually a 'real' boy? To prove himself, Frans proposes a competition to Hassan: whoever can decorate Famke first is the winner.
It's the last day at Camp Koekeloekie, but everyone is mad at each other. When it turns out that Frans is missing, Arnold panics. Who needs to make his show costume for the Variegated Evening?! Ben and Ben urge the Acorns to make up with each other, which in the case of Arnold and Marietje leads to a big confrontation during the colorful evening.