An exciting, well-paced story with only a small number of proofing errors (the second "identify" should've been an "identity" and "be began" should've been a "he"). Other than that I found myself very much enjoying it, although we could perhaps do with a little more backstory about this thing than a slipped-in allusion to genetic predisposition. I also found the ending a little unsatisfying, but I hope that's because there'll be more to come!