 Lynn Morley, a ten year old girl with quite an imagination, believes that her older sister, Judith, is being trained as a witch by their odd neighbor, Mrs. Tuggle. No one else seems to notice Judith s strange new behaviors and habits, like reading tarot cards and spending time with a mysterious young man whom she raised from the lake near their house. Convinced that she alone can stop her sister from falling completely under Mrs. Tuggle s influence, she and her best friend Mouse attempt to gather evidence. But before they can find a way to vanquish their foe, Lynn s mother is called away unexpectedly, and Lynn and her siblings are left in Mrs. Tuggle s care...on a dark and stormy night. Will Lynn be able to break the spell before Lynn s little brother becomes Judith s victim?