Published in Ellery Queen Mystery Magazine, 11/1976. Also printed in the magazine Ellery Queen's Anthology #41 (Spring/Summer 1981) and the book Ellery Queen Masters Of Mystery (1987)
Recently retired, Rand agrees to give a talk on codes at a crime writer's conference. One of the attendees, writing a book exposing a WWII collaborator, is blown up in the hotel lobby and Rand is asked to help investigate.