The Trouble With Spies
Mark McShane, Burt Kennedy
Donald Sutherland as Appleton Porter, Ned Beatty as Harry Lewis, Ruth Gordon as Mrs. Arkwright, Michael Hordern as Jason Locke, Robert Morley as Angus
Appleton Porter is sent to find another agent named George Trent. Base on the 4th book. The movie had the tag line "The Most Bumbling Secret Agent Ever to Pack a Gun."