When the ruthless, drug-dealing natural father of Ann Nolan's adopted daughter plots to take back his child, Ann flees across the country, changes her name and starts a new life - as an investigator for the Mercy Street Foundation, the billionaire-endowed organisation dedicated to finding missing persons.

Now Emme Caldwell, she takes the lead in a case looking into the disappearance of nineteen-year-old Belinda Hudson, whose last steps took her to a fertility clinic and the mysterious Donor 1735. Belinda was close to discovering who her anonymous donor father is, but perhaps she was too close. Now, the deeper Emme digs, the more she wonders if she's escaped one dangerous man only to run head-on into the grasp of another, who's far more desperate and deadly...