Cthulhu By Gaslight Investigator's GuideCthulhu by Gaslight takes the Call of Cthulhu roleplaying game to the fog shrouded streets of Great Britain and beyond. A New Setting The 1880sVictorian England. Mystery and adventure in fog shrouded streets and alleyways. Secret cabals commit grisly murder, wicked crimes, and pledge to bring about the ruin of civilizationall within the square mile of the City of London. The Complete Rules Cthulhu by Gaslight is a stand alone game, and contains the