The 39 Steps

An involving tale of intrigue, well written and well paced, with an engaging main character, Richard Hannay. Perhaps little dated, being set just before the outbreak of World War I. The plot is driven by just one or two too many coincidences to be completely convincing.
Still, a worthwhile read. I plan to add some of Buchan's other novels featuring Richard Hannay to my list of books to read, perhaps as a guilty pleasure.