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Powers are awoken inside Kate Fuller when her mother dies. Powers that she doesn't understand, that she must learn to practice. That scare her father and the people of her town so much that she has to run into the woods and live alone in the safe haven she finds there. She also finds Seth Gecko, who's been trapped inside the body of a wolf for too long, and becomes her familiar when she changes him back into a human.
Of course, there's more to the story than just that. This is a not so modern folktale.