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Angel with Attitude (Warner Forever) (edition 2006)
Angel with Attitude by Michelle Rowan
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Just kicked out of Heaven, former angel Valerie Grace is determined to overcome her banishment and find redemption, but her quest is complicated by her best friend, a somewhat perverted human-turned-talking-rat, and by Nathaniel, a Tempter Demon who is doing his best to lure her to Hell.
(summary from another edition)