Homer, a bold and smart-mouthed angel, has been in isolation for nine-hundred years. She misbehaves and tests the boundaries of God, which was what put her in isolation in the first place. She doesn't like the simpering League of Angels members, especially Gabriel--she has no place for such a goody two-shoes--and she doesn't trust God and cares little what anyone thinks of her. Despite her fussiness and track record of failure, she's sent to Earth to do what needs to be done.
Her mission is to help Tom summers, a struggling columnist for an expanding magazine empire in Los Angeles--to Homer, the epicenter of Western egocentrism and inauthenticity. She must help him publish a book that would ultimately change Earth's fate. Unsure how to accomplish her task, she wants more of God's help or for Him to send Tom a sign, but always a stickler for free will, God won't let her interfere with humanity. Still, it's up to her to save the world, she believes God is against her, and time is ticking. No pressure.
Left to her own devices, Homer wonders whether humanity is worth saving. She believes humans to be violent, self-centered brats. Earth itself is a trash heap, already polluted by all of God's chosen people. Is there anything left to save? Tom, along with some other eccentric Earth-walkers, might change her perspective, but in the end, the fate of the world rests in Homer's angelic hands.