I enjoyed Andrew Marr's series Paperback Heroes a couple of months ago - especially the episode on spy fiction - and scribbled down several titles to be read later. So this was my not-very-Christmassy Christmas reading and a jolly good read it was, taken with a whiskey sour. (Give me the classic cocktails, not the fancy ones!) I even got to watch the 1943 film, seemingly made with a great deal of involvement, but not actually directed by Orson Welles. The film stayed fairly true to the book, until the ending went way over the top. I've never read Eric Ambler before but I'll definitely seek out some more.
Right now I'm belting through The Secrets of Wishtide, a thoroughly enjoyable Victorian murder mystery introducing lady detective Mrs Laetitia Rodd. To be honest, it's also thoroughly derivative and owes much to Steerforth and little Em'ly as well as the original female detective Mrs Gladden. But it's a nice easy read and a good excuse for not even thinking about venturing out into icy fog.