Zac & Mia, Paperback by Betts, A. J., ISBN 0544668782, ISBN-13 9780544668782, Like New Used, Free shipping in the US

"The last person Zac expects in the room next door is a girl like Mia, angry and feisty with questionable taste in music. In the real world, he wouldn't--couldn't--be friends with her. In hospital different rules apply, and what begins as a knock on the wall leads to a note--then a friendship neither of them sees coming"--