Rogue Male
Geoffrey Household, 1939, New York Review Books, with a 2007 introduction by Victoria Nelson.
An unnamed British hunter lines up his rifle on an unnamed dictator (Hitler) and is captured, tortured, and left for dead. The novel describes his escape, evading the dictator's extensive spy network with woodcraft and cunning. In the same genre as John Buchan's Thirty Nine Steps and four other novels about Richard Hanney. Household's book is less jingoistic and more psychological - a better story IMHO. I've ordered the sequel, Rogue Justice.