The latest in a long line of psychically-gifted females, Ruby Davis can see through the veil that separates this world and the next, helping grounded souls to move towards the light - or 'home' as Ruby calls it. Not just a job for Ruby, it's a crusade and one she wants to bring to the High Street. Psychic Surveys is born.

Based in Lewes, East Sussex, Ruby and her team of freelance psychics have been kept busy of late. Specialising in domestic cases, their solid reputation is spreading - it's not just the dead that can rest in peace but the living too. All is threatened when Ruby receives a call from the irate new owner of Highdown Hall. Film star Cynthia Hart is still in residence, despite having died in 1958.

Winter deepens and so does the mystery surrounding Cynthia. She insists the devil is blocking her path to the light long after Psychic Surveys have 'disproved' it. Investigating her apparently unblemished background, Ruby is pulled further and further into Cynthia's world and the darkness that now inhabits it. For the first time in her career, Ruby's deepest beliefs are challenged.

Does evil truly exist? And if so, is it the most relentless force of all?