There is a killer loose on the streets of London, one that evades security cameras, is not held by locks, and savagely mutilates his victims. When the murderer switches from unknown prostitutes to Julie Longmuir, a beautiful actress at the height of her success, no woman feels safe.

As the press begin to draw uncomfortable comparisons with Jack the Ripper, Jane Sullivan, heading up the police investigation, grudgingly has to agree. But the religious writing, scrawled on the wall in Julie Longmuir's blood, is outside Jane's area of expertise. Roping in Jacob Prior, a disillusioned theologian, they attempt to pick apart the demonic delusions of this Ripper copycat. They must act quickly, as events are spiralling out of control, and Jane is next on the killer's list.

Jane will be tested beyond the limits of standard police work, as the esoteric insinuates itself into the investigation. For events are linked to the clandestine Priory in the Pyrenees, the home of a secret Christian sect that pre-dates the Knights Templar. Jane and Jacob are faced with a deeper mystery than they had ever dreamed of; are they simply dealing with a psychopath, or is this something bigger, is this The End of Days?