Fin's sworn off his magic diary ut he needs help. A newish boy, Cliff Sharpnel, is stepping on his toes. Not only does he play the guitar, but he's interested in Claudia Ronson the most beautiful girl at school. When their teacher, Mrs. Johnson, announces that she has written a musical, Fin thinks he's too cool to audition. Until he discovers that the hero gets to kiss the girl at the end mostly likely to be Claudia and that Cliff is auditioning! The diary HAS to come out again.