Central Kansas Library System

When Henry Day is seven years old, he is kidnapped by ageless beings called changelings, who leave another child in Henry's place, a boy who will be his duplicate. Haunted by memories, both boys are driven to search for the keys to whom they once were before they switched places.

In the wake of his parents' separation, ten-year-old Billy seems to have continual conflicts with his father, who is also his basketball coach, but his quiet, younger brother Ben, a piano prodigy, is having even more trouble adjusting, and only Billy seems to notice.