When the young Sherlock Holmes is truly bored, he sends messengers to the agents of Scotland Yard. They bring valuable clues about the cases that baffle the professionals. One evening, as he returns home from the library, Sherlock watches in astonishment as a group of men abducts his friend and roommate Ron. Holmes manages to stop one of them, but the rest escape. He contacts Colin, a sharp-witted friend at Scotland Yard, to inform him about the events. However, Ron is not the only person who has been kidnapped. Even the elite of London has long been affected by these strange kidnapping cases. After "Sherlock Holmes & the Necronomicon," Sylvain Cordurié returns to the early days of Sherlock Holmes and tells the story of England's most famous detective before he became a legend.