“Wickedly smart, devious as hell, and lightning fast.” -Jonathan Maberry, New York Times bestselling author “A suspenseful and disturbing sci-fi thriller about the interweaving nature of trauma, memory, and identity.”—Peter Clines, New York Times bestselling author In this claustrophobic science fiction thriller, a woman begins to doubt her own sanity and reality itself when she undergoes a dangerous experiment. The Ganymede facility is a fresh start. At least that's what Senna tells herself when she arrives to take part in a cutting-edge scientific treatment in which participants have traumatic memories erased. And Senna has reasons for wanting to escape her past. But almost as soon as the treatment begins, Senna finds more than just her traumatic memories disappearing. She hardly recognizes her new life or herself. Even though the cure might justify the side effects of the process, Senna knows that something isn't right. As the side effects worsen, she will need to band together with the other participants to unravel the mystery of her present and save her future.