The Divide by Elizabeth Kay
The author was a very good writer and she made the characters and the dialogue very interesting. The story flowed really well and overall it was an entertaining read.
Felix is a 13 year old boy with a serious heart condition and no friends. While visiting Costa Rica with his parents Felix stands astride the Continental Divide and is magically transported into another world where mythological creatures are commonplace and humans and other animals are considered myths. After entering the new world Felix soon makes his first friend, a tangle child named Betony. Betony and Felix must work together to find a cure for his illness and a way for him to return home.