PATRICK CAMPBELL, P.Eng., M.Bt., was born in Selkirk, Manitoba in 1923, and was educated in Manitoba and in England. He was apprenticed in the aircraft industry during the war, and was subsequently a disarmament officer with the Control Commission for Germany. He returned to Canada in 1952, and was employed in the aircraft industry and in marine engineering until retirement in 1993. He became a devoted Sherlockian in 1987, and has served seven years as Sovereign of the Bimetallic Question of Montreal, and has won the coveted Derrick Murdoch Memorial Award an unprecedented three times. Shades of Sherlock is his first Sherlockian volume, following a book recording the history of aircraft manufacture at Canadian Vickers and Canadair.