At the Burg Geroldseck retirement home, 10-year-old Max has finally found true friends: The adventurous pensioners Vera, Horst and Kilian from table no. 7 are always there for him. It's just that things aren't going so well in his new class and in the soccer team. Horst wants to help and challenges coach Ströhle to a duel: Max and the old geezers against the school team! Then the old knight's castle starts to be haunted...