Matt Helm

Matt Helm is a fictional character created by author Donald Hamilton. He is a U.S. government counter-agent—a man whose primary job is to kill or nullify enemy agents—not a spy or secret agent in the ordinary sense of the term as used in spy thrillers.

Published between 1960 and 1993, the 27 books in the series portrayed Helm as jaded, ruthless, pragmatic, and competent. The series was noted for its between-books continuity, which was somewhat rare for the genre. In the later books, Helm's origins as a man of action in World War II disappeared and he became an apparently ageless character, a common fate of long-running fictional heroes.