Dead Ends by Erin Lange
Dane Washington and Billy D couldn't be more different. Dane is clever and popular, but he's also a violent rebel. Billy D has Down's Syndrome, plays by the rules and hangs out with teachers in his lunch break. But Dane and Billy have more in common than they think - both their fathers are missing. Maybe they'll just have to suck up their differences and get on with helping each other find some answers. Powerful, funny, moving - the ultimate coming-of-age novel.