Cynical London detective John Verney (Martin Kemp) is on the trail of a sinister masked serial killer cutting a swathe through London's underworld. With mounting pressure from his superior (David Yip) for a quick result and social media feeding public unrest, Verney uncovers a terrifying plot involving a secret cult, Jack The Ripper and the Plague Doctors of old. With his son kidnapped and held prisoner and his colleagues turned against him, Verney must risk everything to uncover the terrifying truth.