Mel knows nothing about Earth and humans. Alex knows nothing of their past. Mel is a fallen angel with a thirst for revenge. Alex is a half demon trying to discover their past. Mel is starving, her only food the memories of humans. Alex is hungering for the souls of mortals. When their paths cross due to forces much greater than fate, what will happen? Yin and yang. Heaven and hell. Angel and demon. Welcome to purgatory.