Tom and Mirjam want to save Captain Brandenburg and are about to leave to search him. Once they reach the island in the river, someone has damaged their float and makes it impossible for them to return to home.

Tom, Mirjam and Snuf are heading out to do research and discovers the way ''Vliegende Volckert'' manages to escape every time.

Tom, Mirjam and Snuf are staying over on a farm, where they bump into a dangerous smuggling ring. They move to an old haunted castle, while Snuf notices something strange.