If you specifically mean the Hannay-centric ones, I'd start at the beginning with the Thirty-Nine Steps. Actually Greenmantle (the second) is a better book, and Mr Standfast better yet, but it's worth reading them in order, I think.
If you just want to try Buchan, I'd recommend 'The Dancing Floor' (which is one of the ones with a more supernatural element) or 'The Courts of the Morning' (involving a revolution in South America), or, from the historicals, "The Free Fishers", or "Witchwood" (probably his best book). He was also a very good short story writer - there are some good anthologies. "John MacNab" is tremendous fun, too... sorry, this isn't very helpful, is it?
I have had this plot bunny for ages about a Hannay-Wimsey crossover, set in WWI (and involving the incident where Peter walks into a German staff room in disguise), but I'm having great difficulty getting the dates to work.
Oh, and Buchan
If you just want to try Buchan, I'd recommend 'The Dancing Floor' (which is one of the ones with a more supernatural element) or 'The Courts of the Morning' (involving a revolution in South America), or, from the historicals, "The Free Fishers", or "Witchwood" (probably his best book). He was also a very good short story writer - there are some good anthologies. "John MacNab" is tremendous fun, too... sorry, this isn't very helpful, is it?
I have had this plot bunny for ages about a Hannay-Wimsey crossover, set in WWI (and involving the incident where Peter walks into a German staff room in disguise), but I'm having great difficulty getting the dates to work.