The future. Criminals serve prison sentences before they commit their crimes. Prisons are on new planets that are being colonised. After serving their time, the former prisoners return to their home planet.
An anthology series produced by Thames Television, comprised of short mystery, suspense or crime adaptations featuring, as the title suggests, detectives who were literary contemporaries of Arthur Conan Doyle's Sherlock Holmes.
A company director has been murdered by a perfect stranger. DI Alan Milton is put in charge of the case. He is the former fiancé of the victim's secretary. She is now about to marry a mysterious figure with a connection to the murder suspect.
