When a tired old horse is brought to Heartland, Amy is sure that there's some mystery behind him. Why is Boxer so sad? He won't eat, and he's fading fast. His old owner won't tell her what's going on - but Amy will do anything to bring the life back into Boxer.

 

This book is part of a book series called Heartland .

There are 160 pages in this book. This book was published 2009 by Scholastic .

The Unknown Adventurer is still believed to be at large in the wild.