Hamilton would write a total of 27 Matt Helm novels between 1960 and 1993 (with a 28th volume as yet unpublished). The books maintain a loose continuity between each other, although later volumes would downplay Helm's Second World War connections in order to keep the character up-to-date. In the late 1960s, several motion pictures starring Dean Martin as Helm were produced; these films were produced as comedies and contained little of Hamilton's concepts.
Hamilton wrote 27 Matt Helm novels between 1960 and 1993 (with a 28th volume yet to be published). The books have a loose connection between each other, although later volumes downplay Helm's World War II connections to keep the character current. In the late 1960s, several films starring Dean Martin as Helm were made; these movies were comedies and lacked much of Hamilton's concepts.