London 1925: Ex-boxer Harry Stubbs goes undercover, working in a mental institution to investigate an epidemic of madness. Bizarre deaths occur at the asylum, seemingly linked to an occult power. As he starts to unravel the mystery, Harry's grip on his own sanity becomes increasingly precarious.

Who is behind the killings? What are the strange new treatments doing to the patients? Why can Harry not get any reply from his handlers? To get answers, Harry must to venture into the borderland between magic and science, sanity and madness, and face the Master of Chaos...

A thrilling 1920s adventure drawing on HP Lovecraft's Cthulhu Mythos.