Logan's genome has been hacked. And there's a reason he's been targeted for this upgrade. Worse still, what's happening to him is just the first step in a much larger plan, one to inflict the same changes on humanity at large, and at a terrifying cost. But to have a chance at winning this war, he'll have to become something other than himself. And even as he's fighting, he can't help wondering: what if humanity's only hope for a future really does lie in engineering our own evolution. The mind-bending thriller from Blake Crouch, author of the bestselling 'Dark Matter'.