Being - by popular understanding - the first serious spread of literary criticism on the humble whodunit. "The Simple Art of Murder" of course needs no introduction, but consider some of the co-stars,
e.g. "A Defence of Detective Stories" (G.K. Chesterton), "Trojan Horse Opera" (Anthony Boucher), "The Case of the Early Beginning" (Erle Stanley Gardner), "The Locked-Room Lecture" (John Dickson Carr), "Watson Was a Woman" (Rex Stout), "Who Cares Who Killed Roger Ackroyd?" (Chandler's old nemesis Edmund Wilson), and "From the Memoirs of a Private Detective" (Chandler's old hero Dashiell Hammett). Just about every first-rater - and plenty second-raters - of the era, so bursting with brilliant and completely irreconcilable wisdom that you'll be shocked any one book could print them all without spontaneously combusting.
(Somewhere, perhaps, there lies a rejected essay analyzing the publisher's very own cash-cow sleuths, Frank and Joe Hardy.)