Brian Azzarello 
Faithless #1 [PDF ebook] 

Faith likes to dabble with magic. Her friends think it’s cute-and not just a little off-putting, but it’s part of her charm and her warped search for purpose in a world that makes too much sense. But she’s a true believer and knows there is a power within her reach. She’s right, of course. It just took a while for that magic, that temptation, that unknowable thing to find her . . . In short-Faith is bored as hell. And Hell has noticed.