As they enter sophomore year at Monster High, Clawdeen Wolf, Draculaura and Frankie Stein face new students, new powers, and an even bigger threat that could not only tear their friendship apart but could change the world forever.

Grace finds a note from a schoolgirl looking for a friend. Since Grace is still trying to find her place in her new hometown, she excitedly writes back and sets off a chain of events that ultimately changes the lives of three people.