Have you ever read someone's diary? Well has that diary released a giant guardian that wants to destroy you if you don't tell a deep secret? Mordecai, Rigby, and Skips does when Margaret asks if Mordecai and Rigby will water her plants they destroy her diary. But when Skips helps them a little peek from Rigby releases a giant Margaret guardian which they can only stop by like I said a deep secret. Will they reveal a secret or be destroyed by Margaret's diary?