On a schooltrip, Daniel finds an antique shop where he gets a ring that he gives to his girlfriend Nina, a ring that proves his endless love for her, then a magical gate opens to a fantastic medieval world. Nina is kidnapped by the creepy knight Roman and Daniel and his friends follow them through a magical portal. They embark on the dangerous "Path of the 7 Sins" to save Nina. There are dangers and seven difficult riddles of the 7 deadly sins.

One day, gnome Plop receives a letter from his uncle Knap. It states that Uncle Knap is very ill and that he can only heal if he drinks the juice of the Carbuncle root, but that root unfortunately only grows in Plop's forest and there isn't enough time left. Klus decides to build a real airship with which the gnomes can fly to Uncle Knap, but the journey is difficult and not without dangers..