In his introduction Mr. Barzun establishes the status of the detective short story (not novel) and examines the hall marks that make it a literary art. This essay establishes the selections as the true medium of detection. In three groupings (classic, modern and historic) the perfectionist will find examples from such able practitioners as Bramah and his blind Max Carrados, Bentley and Trent, Bailey and Fortune, Freeman and Thorndyke, Sayers and Egg, Chesterton and Livingston. There are also MacDonald, Crispin, Stout, Gilbert and others and a story that comes from 1776 and two from the early 19th century. A windfall for the demanding follower of this medium.