In an instant, a blinding flash of light carved New York City into pieces and a million people died. The disaster remained a mystery until seven years later, when newly minted time travelers Charlotte, Monroe, and Bill discover The Blast was caused by one of their own. The Blast shouldn’t have happened—history has been rewritten—meaning millions of lives can be saved, but at what cost?

Even if they can defuse every bomb that caused the disaster, their own history will be rewritten in unpredictable ways. They could come back to a future where Charlotte never had a son, where Monroe and Bill never fell in love, or even where one of them died years ago.