As they begin fifth grade, Rupert and Amelia discover that their teacher, Miss Switch, is a witch. Using his scientific mind, Rupert helps her solve a spooky dilemma. In return, the witch teaches Rupert and Amelia some magic. But soon Miss Switch disappears, and another teacher takes her place. One night that winter, a dark figure delivers a strange bottle to the children. Scientific curiosity leads Rupert to take the cork out. Suddenly, the bottle...