The Thirty Nine Steps

I was in a charity shop the other day when I saw a nice copy of John Buchan's novella, The Thirty Nine Steps.(Published by Polygon). I started reading it and half way through remembered that some years before I had bought a very nice illustrated hardback edition and so started reading that edition. (That one is pubkished by Chatto & Windus). It's a great little thriller with plenty of good background material on London and Scotland. The plot is a little unlikely, of course, but still a good yarn. I wonder of the other books in the Richard Hanney series are any good.