London, 1899. The city is ravaged by heinous crimes, the solutions of which remain shrouded in darkness. The Scotland Yard police are groping in the dark and call upon the best detectives to assist in solving the case. Each investigator must use all their skills to determine which of the 13 clues belong to their assigned case. By questioning witnesses and consulting secret informants, it will be possible to formulate the charges and uncover the perpetrator, the location, and the weapon.