Baroness Emmuska Orczy 
The Old Man in the Corner 

A nameless, eccentric old man, sitting in the corner of a cozy London tea shop, uses pure deduction to solve a series of baffling crimes — from gruesome murders and cases of deadly blackmail, to daring thefts and brilliant deceptions. For devotees of Sherlock Holmes —ingenious, well-crafted twelve mysteries 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.