The students at Sheffield Institute get their midterm results; everybody is happy with their grades except Taranee. Cedric's disguise as a bookseller attracts Cornelia, Elyon, Irma, Taranee, and Hay Lin to the store to look for history books and to admire Cedric. While in the bookstore, the W.I.T.C.H. girls inadvertently touch an inversion point and find themselves in the middle of a Labyrinth inside Phobos' castle. Blunk, who was in the store at the time, manages to get word to Will. Will and Caleb launch a rescue mission. Meanwhile, the others are smuggled out of the castle by a kitchen worker named Trill, who tells them about Phobos' sister. The Tracker, a hunter working for Phobos, arrives and chases the girls through the woods until Will shows up with the Heart. They quickly defeat the Tracker. In the B-story, Caleb starts work at the Silver Dragon restaurant.