In a dark future, when North America has split into two warring nations, fifteen-year-olds Day, a famous criminal, and prodigy June, the brilliant soldier hired to capture him, discover that they have a common enemy.

Every night, ever since Conor's mother fell ill and started the treatments that don't seem to be working, Conor has had the same dream. But tonight is different. Tonight there's a visitor at his window. It's ancient, elemental, a force of nature. And it wants the most dangerous thing of all from Conor, It wants the truth.