Oscar Wilde meets Ian Fleming. It's a camp, witty, dark and amoral tale about an Edwardian-era James Bond but more importantly it's a real ripping yarn. I was about to say that I hope Mark Gatiss isn't too busy being one of the League of Gentlemen to send Lucifer Box off on further adventures, when I discovered that he already has
If you're that way inclined, it's also available as a graphic novel.
See all the books I've recommended so far here.