It's officially spring break at Monster High™! Lagoona Blue™ takes her gilfriends across the sea to the Great Barrier Reef, but they are shipwrecked and end up on a mysterious skull shaped island. Here, they enjoy the local hospitality until they realize that they are being used by a slippery showman named Farnum to lure the rarest, most mysterious monster of them all, the "Beast of Skull Shores," into a trap. Frankie Stein™ is taken by the Beast, but tables turn and she ends up rescuing him and returning him to Monster High™. The story goes into high voltage when they realize that Frankie has inadvertently led Farnum to the location of the greatest gathering of monsters anywhere… Monster High™!