Seven years ago, young Stella Pierce vanished from the face of the earth. Now her grieving, broken family—along with Detective Orson Cheever, who never stopped working her case—is stunned by her mysterious return.

The now-teenage girl claims to have spent her missing years in the company of Travelers—extraterrestrial nomads—voyaging through space.

Despite her family's effort to keep Stella's incredible tale secret, the story becomes a national sensation. Most people want to discount her story, saying it's the result of trauma; only Detective Cheever seems to want the same thing Stella does: the truth.

The enigmatic Stella finds herself in the eye of the storm while vying forces—some visible and some not—swirl around her. Is it her tale that is incredible, or is it Stella? As new questions surrounding the girl gain terrifying urgency, Cheever learns that there is nothing—and no one—he can trust.