Seventeen-year-old Hylee Williams didn’t ask to disappear. She didn’t ask to move from Kansas City, Kansas out to the suburbs in Missouri. But she did disappear, and not only that, but when she vanished from our world, she materialized in a dark, twisted version of the night that changed her life forever: the night her older brother went missing.

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Just as Hylee realizes this moment could be the key to unraveling the truth about her brother, she’s yanked away from the dark place back to our world. Craving a sense of normalcy, she goes to a party with her best friend—where she meets Eilam Roads. Tall, handsome, and undeniably, inexplicably familiar, Hylee can’t help the pull she feels towards him. It’s a classic teen girl-meets-boy situation, until it happens again. She disappears, right in front of him.

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Together, Hylee and Eilam investigate the truth about time, space, and reality, with Hylee increasingly convinced her time travel holds the key to saving her brother. But the more they learn, the more Hylee begins to see darkness lurking in her world—and in herself.