Tainted — Julie Kenner

Lily Carlyle has never been a good girl. She's lied, cheated, and stolen, but she did it all to protect her younger sister. To keep food on the table after their mother died. She'd made a promise, after all. A promise to take care of her sister. To keep the family together. And that's a promise she's determined to keep.

Even to the death...
When her sister is brutally attacked, a vengeful Lily resolves to exact her own justice from the monster responsible. She succeeds -- at the cost of her own life. As she lies dying, she is given a second chance: Though what she has done is evil, she can earn her way into paradise by fighting for the forces of good.

Lila agrees...
...and wakes in the body of Alice Purdue -- a Boston barmaid who has more than a little familiarity with the battle raging between the light and the darkness. Each side is mustering its forces for all-out war -- and Lily is going to become an assassin for the light.

It's a job she believes she can really get into-but she doesn't realize that she may not be able to get out...