“I follow the trail like a bloodhound and sense what the reader wants. And what he’ll buy”—this is how the master explained the success of his novels, eagerly revealing the gold-bearing secret: readers are attracted by “action and rhythm.” In the twentieth century, there was no room for leisurely old-fashioned stories in which an eccentric detective investigates the mysterious murder of an aristocrat in the cozy setting of a country manor; according to the laws of the new time, the detective fires his revolver almost as often as he uses deduction.