Sign is a private investigator who can track anything and everything with alchemy and spells, but she tries to hide her Wizard status. However, when a monster of unspeakable evil breaks free from its prison in the basement of her newly acquired shop and steals the skin of a construction worker. She uses every type of tracking spell she could muster, with the help of the Mane 6, Spike and Big Macintosh, and tries to find and destroy the monster before it can take the Night Princess' skin when she comes to visit the citizens of Ponyville.