Before a masked abductor knocks him unconscious, the last words Jason Dessen hears are, "Are you happy with your life?" He wakes to find a stranger staring down at him, calling him friend. His wife is not his wife. His child was never born. He is not a simple college physics professor anymore but a celebrated genius who has achieved the unimaginable. Jason wants to go back to the other world, to the family he loves, but to do so will require a terrifying journey to confront a seemingly unbeatable foe.

Originally published: New York : Crown, 2016. Includes readers' guide.