John and Naomi Klaesson are devastated after the death of their child from a rare genetic disorder. More than anything they want another, but the chances of their next child being born with the same defect are high. Then they hear about Doctor Leo Dettore. He has methods that can spare them the heartache of ever losing another child to any disease, and so begins their journey. They should have known something was wrong when they saw the list. Choose the eye colour, hair, great sporting ability. They can design their child. Now it's too late to turn back. Naomi is pregnant, and already something is wrong...