Last week, I was moved to reflect upon the end of the archetypal Golden Age detective novel, and this week I’m moved to reflect on its beginning. The essential ludic air at the heart of the best of the genre is not quite there in The Duke of York’s Steps, but one can feel the inalienable ingredients of the form straggling into line to give shape to a story that retains fidelity to a type of plot that, at this stage, was understood if not quite mastered. If anything, the mystery feels almost over-subtle — like Antidote to Venom, it seems a trifle unlikely that such a set of circumstances as these would come to warrant criminal investigation — and so approximately the first quarter is spent trying to manufacture the necessary traction for the detection to begin in earnest.