Peter James, who has built a huge fan base with his Roy Grace thrillers, delivers a thriller grounded in human genetics. What would happen if you were given the opportunity to design your perfect child – its levels of empathy, emotional strength and interests? John and Naomi visit Dr Leo Dettore because he can guarantee them a child free of the genetic disorder that killed their first son. John and Naomi have a chance to make a perfect child. Do they take it? – See more at: