A Puzzle for Fools, by Patrick Quentin

 9781613161258American Mystery Classics, Penzler Publishersoriginally published 1936237 pppaperback"It had been a puzzle for fools..."A Puzzle for Fools is #21 on the Borges/Bioy Séptimo Círculo list, and it's a good one.  It is also the mystery series opener for the nine books featuring Peter Duluth, Broadway producer, ranging datewise from 1936 to 1954.    Peter Duluth has known his share of