Seventeen-year-old Carrie is lying in her backyard ignoring all the looming responsibilities in her life, when a fox makes a mad dash across the grass in front of her. After she manages to keep her dog from attacking the frightened animal, the fox turns to Carrie and bows in gratitude before disappearing into the bushes. All Carrie knows in that moment is that something has unexpectedly changed in her life.

Carrie has been best friends with Lindsay Smith and Rebecca Campbell for years. During a summer when they should focus on choosing colleges, the girls suddenly find...