Ivy, Carrie, and David stay after school to work on a special book project. When the lights suddenly go out, Mrs. Huffity leaves Carrie in charge with instructions to keep everyone inside. Carrie never imagined how hard that could be. Goblins attack and her friends are scattered. Now it's up to Carrie to keep everyone safe, including a baby unicorn that the goblins desperately want to take. Can she protect the unicorn and save the day?