暗网
Traveling back to Los Angeles, Reacher and Chang reunite with Westwood. Going over all that they learned from McCann's sister and neighbor, Reacher posits that Peter was investigating the disappearance of his son, Michael. Michael had suffered from anhedonia and was a recluse who spent the majority of his time on the Internet. As the call from "Maloney" had been about the Deep Web, Reacher, Chang and Westwood meet with an associate of Westwood's, a computer hacker in Palo Alto. Westwood's contact is able to discover that Mother's Rest has a Deep Web site providing assisted euthanasia services. They further find that Michael had been speaking with suicidal persons over the Deep Web and arranged to meet one of them in Mother's Rest to undergo euthanasia together.