Dark Moon Nightmare Hall Series, Book 23.

By moonlight, a psychotic teenager unleashes a terrifying evil on Salem UniversityEve Forsythe has been chosen to cochair Salem U's annual Founders' Day celebration, and she is determined to make sure everything goes off without a hitch. The honor student can't let anyone see that beneath her perfectionist exterior is a teenager terrified she'll make a mistake. Eve's worst fears are realized when, on the first day of the festival, a runaway horse...