Donald Sutherland Swanson was born in the remote far north of Scotland, leaving for London in 1867 at the age of 19 and initially working as a City clerk. The following year he joined the Metropolitan Police and began patrolling the streets of the capital as a uniformed constable. 35 years later he retired as Superintendent of the Criminal Investigation Department, the top detective in the country. He is best known as the detective in charge of...