Vampires

Creatures of the night that feed on the blood of others.
A Vampire was found masquerading as a customer in the Whitechapel whorehouse that aided the Rippers in bringing the rampage of their psychotic ally, Bond, to an end. In doing so, it fed regularly, but was putting the lives of the workers there in terrible danger, and indeed the lives of all of those in Whitechapel, should it take too much one night and the whore arise again, hungry and unknowing of their new strength.
Once it had been encountered, it was immobilised by the placing of a wooden stake through it's heart, then decapitated to ensure that it could not rise again.