A group of teenagers must somehow survive the night when they find themselves trapped within a pentagram. To stay inside the candlelit confines means safety; to escape means certain death at the hands of a mysterious entity.

Jaded detective John Verney is on the trail of an ancient cult of Plague Doctors which is cutting a bloody swathe through the London underworld. Dismissed by his superiors as gang on gang killings, the murders draw Verney into an obsessive maze of a secret society conspiracy with links to the Jack The Ripper murders of 1888, putting him and his family in grave danger.