Final part of the supernatural thriller series. Drained physically and emotionally by her own demons, the last thing Merrily wants to do is battle anybody else's. Spurred on by mentor Huw Owen, Merrily puts the final pieces of the jigsaw into place and soon realises that she must find the strength to fight evil if she is to save her daughter's soul. With Anna Maxwell Martin, David Threlfall, Siobhan Finneran, Kate Dickie, and Nicholas Pinnock.