When Malle Pietje falls ill from spoiled food, Swiebertje wants to help his good friend. He buys expensive herbs from a quack, but they turn out to be worthless. When Swiebertje finds out that he has been cheated, he decides to visit the quack one more time...

A good acquaintance of Swiebertje gets into trouble: he has lost a lot of money by buying worthless shares. When Swieb tries to get the money back, he gets into trouble with Bromsnor. Fortunately, there is always Cornelia, Brom's wife. She knows how to expose the corrupt mediator!

Swiebertje is once again without money. Through the intervention of Bromsnor and on the recommendation of the mayor, he gets a job as a jack of all trades at Mrs. Deuterhops. Hope it turns out fine!

Swiebertje has to repair the lambs' stable at a farmer, but he falls asleep. The lambs escape, causing the farmer to suspect Swiebertje of theft! Swieb does not give up and investigates with the help of Bromsnor and Malle Pietje. Will they find the lambs again!