To help his friend to give up a crippling cocaine addiction, Dr Watson (Robert Duvall) introduces world-famous detective Sherlock Holmes to psychiatrist Sigmund Freud. But while under treatment, Holmes embroils himself in a kidnap case and Freud discovers a disturbing secret in his patient’s subconscious.

As with the later Murder by Decree (1979), The Seven-Per-Cent Solution (1977) places Holmes in an adventure with real-life characters. With plenty of twists and turns and some nifty detective work, the ingenious intertwining of the fictional with reality makes for a fascinating romp and a highly original take on Arthur Conan Doyle’s greatest creation.