Unforgiven (Lauren Kate's Fallen Series)

Every story has a dark side, and this story belongs to Cam, the brooding, bad-boy dark angel FALLEN readers love.
 
High school can be hell.
 
Cam knows what it’s like to be haunted. He’s spent more time in Hell than any angel ever should. And his freshest Hell is high school, where Lilith, the girl he can’t stop loving, is serving out a punishment for his crimes.

Cam made a bet with Lucifer: he has fifteen days to convince the only girl who really matters to h…