Water for elephants, by Sara Gruen

This won an Alex Award in 2006 as a book written for adults with special appeal to teens. I don't know that there needs to be to much of a line drawn between teen and adult books - every reader on either side of that line just needs to find their own loved books.

This tale set aboard a depression era circus train has lots going for it. It is first of all a romance, but the circus is full of memorable characters, not the least of which are Rosie the elephant, Bobo the chimp, horses, big cats. As the circus vet, Jacob Jankowski knows and loves them all. His love for Marlena, the beautiful (and married) equestrian star sets them all - humans and animals alike - on a dangerous path.

Deadline, by Chris Crutcher

This book was one of the 2011 Abe books, but I delayed reading it because it concerns a dying teen - emotional stuff. But in the hands of a writer like Chris Crutcher, there are themes worth the inevitable tears here. The main character, Ben Wolf, learns he has terminal cancer during a routine sports physical at the opening of his senior year. Being 18, he refuses to let his doctor tell anyone else and refuses treatment. Instead, he sets about making his last year count for a whole lifetime. In the hands of a lesser writer this could be unbearable. But there is no sentimentality, no unnecessary pulling of heartstrings as smart-ass Ben meets his mortality on his own terms and touches the lives of everyone around him.