Difficult times have come for the famous English detective: a cozy apartment on Baker Street has been replaced by a shack in the Perth penal servitude in Australia, where Sherlock Holmes is serving a sentence for murder. Here Mr. Holmes meets the thief and murderer John Clay, who was once exposed by him. By a strange coincidence, sworn enemies turn into bosom friends. Together they bring to light the head of the prison, who was secretly developing the “leftist” gold mine. But in the end, both have to escape from hard labor. Returning to England. Holmes and Clay decide to restore justice with the help of the mysterious Mr. Lyle, who has volunteered to find the true culprits of their troubles...