Set in 1939, this worthy addition to the American Mystery Classic series from legendary mystery critic Boucher (1911--1968) pits the Baker Street Irregulars, members of the real-life organization of Sherlock Holmes fans, against Stephen Worth, who has been chosen by Metropolis Pictures to write the screenplay for a major movie based on the Holmes story "The Adventure of the Speckled Band." Worth, "the author of many stupid and illogical mystery novels...