Public Law 10927 was clear and direct. Parents were permitted to watch the genetic alterations of their gametes by skilled surgeons...only no one ever requested it. When Lizbeth and Harvey Durant decided to invoke the Law, when Dr. Potter did not rearrange the most unusual genetic structure of their future son, barely an embryo growing in the State's special vat-the consequences of these decisions threatened to be catastrophic. For never before had anyone dared defy the Rulers' decrees...and if They found out, it was well known that the price of disobedience was the extermination of the human race.