Couples are being slaughtered in their homes; women drained of blood, men violently beaten. There are no clues to track the killer, no explanation as to why an increasing amount of blood is being removed from the crime scenes.
Detective Sergeant Rhys Morgan is seconded to the 'Couples Killer' investigation. Tormented by vivid nightmares, he hasn't slept soundly for weeks becoming convinced a creature from these nightmares poses a threat to him and his family. His behaviour becomes increasingly erratic causing his bosses to wonder if he's the right man for the job.
As clues to the killer's identity are uncovered, the line between what is real and what cannot be starts to blur and Rhys discovers the answer to catching the killer and exorcising his own demons, may be as irrational as he fears.