Spiritwood

After spending months in the hospital, 15-year-old Mac is officially in remission from leukemia. He's finally going home, minding his business in the hospital's healing garden, when three men emerge from an oak tree and grab a young boy, dragging him into the tree. Mac is faced with a choice - stay put and hope for discharge, or try to help the kid.

Knowing the boy needs treatment, Mac chooses the latter, stepping through the oak's trunk into the Climbing Tree. Mac soon learns this is the hospital's oak is the central hub to a series of linked worlds that form Spiritwood. He meets Zharo, the troubled prince of a race of tree-bonded dragons.

The unlikely pair must team up to stop an evil king who has been kidnapping kids from Mac's world and extracting the cancer from their blood to use in a spell that keeps him young. The evil spell is poisining the linked world of Spiritwood, threatening Zharo's people, and putting kids like Mac in terrible danger.

Mac and Zharo have the power to stop the king's evil magic, but their forced partnership is fragile. With time running out, they must find a way to work together or Zharo's people will die and the boy Mac followed into Spiritwood won't get the treatment he needs.