When a mentor of Leo's arrives at the Manor with news that a student conjured up a headless horseman and is ultimately terrorizing students and teachers alike at Magic School, the sisters are surprised to learn about the supernatural institution of learning all things magic. They are soon asked to help discover why a student called upon the horseman and stop him before escaping to hurt innocents. Meanwhile while on a vision quest, Phoebe learns something shocking about Chris.

As the family celebrate Wyatt's first birthday, a darklighter arrives at the manor, seeking to kill Leo accidentally sends him and Piper to another plane of existence, Phoebe and Paige mourn their apparent deaths, and Chris is in danger of vanishing forever.