Tesuya Ayukawa was, as the introduction to this collection says, the foremost proponent in his time of the honkaku, or "orthodox" mystery story. These puzzle-centric mysteries were the inspiration for the later stories by Yukito Ayastuji and Taku Ashibe (who wrote the introduction). In fact Ayukawa lived to see the shin honkaku ("new orthodox") movement begin, and also helped many younger writers make their start. This selection of short stories - his best ones, apparently - features two very different detectives. First is the…