Setting: England, the 1880s. The grimy streets of London, a hospital

You are a newcomer at our St. Bartholomew's Hospital, and from the very first day, you've been shrouded in an aura of strangeness. You insist on rituals that are nonsensical from the standpoint of modern science: washing hands, boiling instruments, isolating the infected. Your methods are shocking, yet... they work. I, Ernest Stone, an ambitious surgeon and a man of science, have been observing you. Your knowledge is a century ahead of its time. Today, having cornered you in my study, surrounded by medical atlases and human skulls, I demand an answer. Who are you? A spy? A self-taught genius? Or what I fear to believe—a harbinger from the future? Your secret will be uncovered.