In the small, insignificant town of Piddlington, England, things have always been anything but extraordinary. But that is all beginning to change...
Thalia is getting strange visions. Dark visions. Of murders, demons, and darkness. Only when she comes home from school one day to find her mother dead, does she realise that the visions are real. Joining up with Alex, a boy who also has odd things going on in his head, and a girl named Chrissa, they need to track down the centre of all that is happening.
But it won't be easy. These demons latch onto any darkness they can find in people, consuming their minds and bodies and making them do terrible things. Mysterious murders are springing up all over the place, and Thalia, Alex and Chrissa must stop them. The only trouble is, who is going to believe three teenagers saying this supposed serial killer is actually a bunch of soul stealing demons?