'They have torn apart people I cared about. I want to know what those things are, Colonel.' 'They are a genetic abomination - a split in man's evolution, if you like, Keagan.' Eddie woke up from one nightmare and entered another. Except, in this nightmare, the monsters are real. After years of running away from his past as a medic with the SAS, Eddie Keagan's combat experience is being put to the test again. He is recruited by the shadowy Colonel Sixsmith to guide a Third Blood combat unit through the corridors of a London hospital to hunt Bloodeaters who have fed well on the unfortunate...

When the killings started, Chief Inspector Stern and his team believed another sick and twisted killer was stalking the streets of London looking for their next victim until evidence started to point to something more evil. As Stern desperately tries to find a pattern or a motive to the murders he discovers a secret government department is trying to infiltrate his investigation. Why? Callum Ogilvy knows the answer. As lead investigator for the Department of Paranormal Research, he suspects they have little time left before the ancient force driving the killings strikes again.