Adam Knox comes from a long line of patrician Connecticut doctors -- a line he broke to serve with an NGO in the war-torn Central African Republic. His attempt to protect his patients there from a brutal militia ended in disaster and disgrace, and now he runs a clinic near Los Angeles's Skid Row, making ends meet by making house calls -- cash only, no questions asked -- on those too famous or too criminal to seek other medical care. When a young boy is abandoned at his clinic, Knox is determined to find the boy's family and save him from the not-so-tender mercies of the child welfare bureaucracy. But Knox's search for the volatile woman who may or may not be the boy's mother leads him and his friend, a former Special Forces operator, into a labyrinth of human traffickers, Russian mobsters, and corporate security thugs; and squarely into the sights of a powerful, secretive, and utterly ruthless family that threatens to destroy Dr. Knox and everything -- and everyone -- he holds dear.