Marvin goes to a school camp. It looks dreadful because he still wets his bed... Will he keep it dry?

Twelve-year-old Luuk Bos has always believed that his father is the Strongest Man in the World. His mother Dorien, who raised him on her own, used to tell him the most wonderful stories about it. During a visit to a local Strongest Man competition, he meets a participant, René Doornbos, who, like him, has red hair. Luuk thinks he has found his father.