The Inquisitor by Mark Allen Smith

Geiger is in the business of information retrieval. His job is to torture people until they tell the truth to his clients. His biggest rule is that he doesn't work with children. When he is mistakenly given a boy named Ezra to try and extract the whereabouts of Ezra's father, David Matheson, Geiger rescues Ezra from his client and goes on the run. The client, though, and his henchman, Hall, Ray, and Mitch, will stop at nothing to retrieve Ezra. Geiger, meanwhile, with no memory of his childhood, begins to slowly remember it. The Inquisitor will appeal to people who liked The Cleaner and books by Lee Child. It will be published in March.