"In 1666, a cult made up of the world’s most influential players created an elixir that would grant them vast unholy powers – but something went terribly wrong, and their experiments yielded only bloodthirsty, mutant horrors. As the cult is decimated from the inside by betrayal and the creatures escape into London, a traveling priest and the daughter of a murdered immunlogist fight their way to the center of the city and defeat the evil once and for all… or so they believe."