Ember of night

Harley is unloved by her abusive, alcoholic father. Unwanted by her classmates. Unnoticed by everyone else, but determined to give her kid sister a better chance in life. When Draven, a hot stranger, tells her she's the key to stopping a war between Heaven and Hell, she knows he's a liar. But suddenly everyone is gunning for her-- and Harley needs to figure things out fast. -- adapted from jacket