Set in London during the 19th century, the game features a young Dr. Jekyll, who seeks a cure for the plague but instead unwittingly creates a potion that awakens his dark alter ego, Mr. Hyde. Alternating between the roles of Dr. Jekyll and Mr. Hyde, players will search for an antidote to the epidemic while slowly uncovering a conspiracy involving an occult sect. The investigation will lead players deeper and deeper into Londons mysterious underworld.