Will the girl witch Susan Wylde learn enough magic to defeat the Ghosts of Halloween?

Susan Wylde thinks she is just an ordinary girl living a boring life with her ill father, until she is attacked by a dragon, turns herself invisible, and is invited to study at Wonderworks School of Magic, a school on a floating island that travels the world.

At Wonderworks, Susan soon learns different types of magic, plays magical sports, battles monsters, and visits magical cities, but someone is summoning the Ghosts of Halloween. Susan must stop them or Halloween will last forever!