Professor Challenger seeks the help of Sherlock Holmes and Doctor Watson, along with his good friend, Conan Doyle, to discover the secret of the Fairy Wall, which has mysteriously appeared in London.
At the same time the dark and hideous Hyde, an energy being separated from the famous Doctor Jekyll, is loose in London, sucking the energy of Prostitutes across Whitehall Chapel.
This is the first of a two part adventure that chronicles the Baker Street Adventurers as they pursue clues and villains in an alternate reality London.