The Red Thumb Mark Illustrated

Richard Austin Freeman (1862-1943) was a British writer of detective stories, mostly featuring the medicolegal forensic investigator Dr Thorndyke. He invented the inverted detective story and used some of his early experiences as a colonial surgeon in his novels. A large proportion of the Dr Thorndyke stories involve genuine, but often quite arcane, points of scientific knowledge, from areas such as tropical medicine, metallurgy and toxicology.