All men are sterile. Fertility drugs are given only to couples whose genetic matches are approved. Those without a family history to prove their genetic heritage are outcast from society. Grace is a broken branch. As an orphan, she has no link to The National Family Tree, so she and her husband, Tom, are ecstatic when they’re approved to have a baby. But that was the easy part. Grace’s twin brother inadvertently gets a girl pregnant after a one-night stand, and his girlfriend isn’t happy because it should’ve been her. Both sets of parents soon become the target of a violent terrorist group that advocates genetic purity. To make matters worse, there’s something strange about the unborn children that’s attracting government attention …