In 1888, George becomes ill and bed-ridden. While doing research on the strange mask, Jonathan finds the dying Dario's letter and finds his symptoms are the same as George's. Using Dio's pride against him, Jonathan deduces that Dio murdered Dario and intends to do the same with George. After leaving instructions for only trusted doctors to tend to his father, Jonathan sets off to London to discover the origins of the poison. Fearing Jonathan would ruin his plans, Dio steals the Stone Mask with the intent to arrange an accidental death with it...