I picked up a couple of books last week; a new edition of Rogue Male by Geoffrey Household, and Death in the Lock Grass by Peter Hathaway-Capstick.
Rogue Male is the story of an Englishman on a stalking holiday in Poland in the 1930's, who decides to cross into an un-named country (Germany?) to stalk (but not shoot) an un-named dictator (Hitler?) purely for the challenge. It was written at that time, and is similar (but a lot more full-on) than The 39 Steps. A very good story...if you're my age, you might just about remember the TV adaptation from the late 70's.
Death in the Long Grass was written in the 1970's by an American stockbroker turned African PH...although I've just started it, I think will be a hard one to put down!
If you're looking for a good read, I don't think you'll be disappointed by either of these.