"We don't know where it came from. We don't know what it is. We don't know what it plans to do."

Sixteen-year-old Lillia Kai has an overbearing and negligent foster mother, and when she's not caring for her siblings she spends her afternoons honing her rock-throwing skills in a vacant lot near her home.

Across town, Sherman's drinking problem has left him homeless, alone, and subject to the violence of the streets.

When a strange and unimaginably large object appears in the sky over Louisville, Kentucky, and citizens begin to abandon the city, Lillia and Sherman's lives change forever.