The Terrifying Amusement Park

Zorori builds an amusement park to try to steal Elzie and Arthur's castle. The free day pass they received and signed states that at the end of the day, Zorori would get their castle. Arthur wants to rip it up, but Elzie wants to spend the day at the park. Zorori's attempts to steal the pass from them fail and when he does get it, he's hurled into the air on a firework that destroys the pass when it goes off. Based on book 8.