The book opens with Charlene, Amanda and Finn at a roller-coaster simulator. Charlene designs their rides. Finn and Amanda are put through an insanely dangerous simulation; they begin to suspect Charlene of messing up with them. Later on, the Keepers decide that the Overtakers, the Evil Queen and Cruella de Vil from One Hundred and One Dalmatians especially, are trying to free Maleficent and Chernabog from their prisons. The Evil Queen puts a spell on Finn, but believing he was all clear (a pure DHI) when she did, Finn thinks he's safe.