Oscar, Katia and Martin go hunting the monster of the lake in Providence, Merlou. They discover that journalist Timothy wanted to become famous and that mayor Rudolf had put the lake at risk.
Baltazar is glamoured by an African wizard who is looking for a sparrowhawk. Karlo tries to get Katia to like him. Martin encounters a strange tourist. Oscar, Katia and Martin go after the wizard.
Someone starts kidnapping the contestants of a beauty pageant in Providence. Because Katia is against it taking place, she is suspected of being the kidnapper and is imprisoned. After she gets away she goes undercover to find out who the real perpetrator is.
Providence's doctor Frank develops a new vaccine that puts everybody in deep sleep. While everyone in town but the Serbert brothers is asleep, Oscar, Martin and Katia try to reach the doctor by tricking her.
Jimmy and Melissa bring to life an old branch - the character from a story that punishes the adults who scare or tell kids off. Oscar, Katia and Martin find out about the branch and try to resist it but end up making things worse.
Mr Pepin's model of Providece comes to life. Because people don't respect him, he destroys the Serbert residence, moves Oscar's house in the middle of the lake and paints the teacher's house. Oscar, Martin and Katia go after him, especially since Rudolf wants the model for himself.
In order to be successful, Kunster transforms Rudolf, Tim and Robbie into real monsters for his circus show and plans to infect everyone in Providence, turning them into monsters. Katia, Oscar, Martin try and stop him.
In order to get creative and win a story competition, Gawain brings monsters from children's books to life. Oscar, Katia and Martin fight the monsters.
A count that was arrested by Oscar in the past escapes from prison and comes to Providence to take his revenge against Oscar. Able to change appearance, he is after the secret from Providence as well.
