Después de un curso terrorífico en el instituto, Lagoona invita a sus monstruo-amigas y a su novio Gil a visitar a su familia en La Gran Barrera de Coral. Todo parece divino de la muerte hasta que el yate donde viajan sufre un ataque del Kraken y naufraga. ¿Conseguirán sobrevivir l@s monstruit@s de Monster High?

It's officially Spring Break at Monster High, and Lagoona takes her gilfriends across the sea to the Great Barrier Reef, but they are ship wrecked 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,