| Scholastic Pr, January 27, 2015, cover price $16.99 | About this edition:
The debut of a phenomenal new middle-grade talent.
| Reprint edition (Scholastic Pr, December 29, 2015), cover price $6.99 | About this edition:
A bold new voice in children's fiction debuts with this story of a boy, his dog, and the mountains they face together.
| Reprint edition (Turtleback Books, December 29, 2015), cover price $17.20