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!