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"You have to kill him." Imprisoned in the heart of a secret military base, Em has nothing except the voice of the boy in the cell next door and the list of instructions she finds taped inside the drain. Only Em can complete the final instruction. She's tried everything to prevent the creation of a time machine that will tear the world apart. She holds the proof: a list she has never seen before, written in her own hand. Each failed attempt in the past has led her to the same terrible present - imprisoned and tortured by a sadistic man called "the doctor" while war rages outside.