Arthur Conan Doyle reveals the story behind Sherlock Holmes and his mysteries by telling about Dr. Joseph Bell.

When Elpseth’s sister, Lady Sarah Carlisle, falls ill, Doyle comes to believe that her husband, Sir Henry Carlisle, who is a Member of Parliament, may be behind some of the killings.

When one of his new patients comes in complaining of having hallucinations of a strange masked cyclist following her home, Dr. Doyle calls on his friend Dr. Joseph Bell to assist him with checking in to the young lady’s situation.