In the marshy region of Las Marismas in southern Spain lives an amateur composer who experiments with the music of sorcery. He never completes his composition, but the few notes he plays are enough to awaken Tengel the Evil. Young Vetle Volden of the Ice People is hurriedly sent to destroy the music and prevent a catastrophe. But Tengel has powerful allies, and one of them is already on the way to stop Vetle.