Riley Madison is a Shifter, one of the human population born with the ability to transform into their spirit animal. Knowing your spirit animal means knowing what kind of person you are. Most Shifters identify their spirit animal by puberty. Riley is approaching seventeen and still doesn't know hers; a fact that's beginning to worry her. She befriends Tristan Dawes, another Shifter in the same situation, and quickly finds their fates are connected...