Dead Ringer — I.B. Melchior

Perhaps you've encountered that strange, unsettled feeling of familiarity - haven't you been here before? Hasn't this experience already happened in exactly the same way? What if that wasn't you. What if that was your duplicate, the result of an atomic experiment that has taken an unexpected turn, creating a process that can replicate and manipulate living matter - with untold potential, but terrifying consequences.