Detective Catrin Price has returned to Cardiff after 12 years to finally lay to rest the ghosts of her past. Then her ex-boyfriend Rhys, once a promising policeman but now a washed-up junkie, is found dead. The official verdict is an accidental overdose but Cat is convinced that there is something more, something that will explain why the man who once saved her life was so unwilling to save his own. But Cat¡s troubles have only just begun. Discovering that Rhys was investigating the disappearance of a troubled rock star, she finds herself drawn into the terrifying world of a cult.