These Twelve Mysteries by the Author of 'The Scarlet Pimpernel' Concern a Mysterious Armchair Detective who Solves Crimes from Reports and Using Logic. The Stories Describe Murders, Blackmail, Theft and Deception, but All Have as Their Setting the Fog-Cloaked Edwardian Streets: Fenchurch Street, Percy Street and Lisson Grove in London. Dublin, Glasgow, and Liverpool are Also Home to Cases That Have Baffled Detectives.