The angular, modernist house was an unexpected bargain for Zoe and Jonathan Mahonie - newcomers to the city of Hereford and apparently unaware that the house’s pristine, white interior walls had been coated with the lifeblood of a previous owner.

How is Merrily Watkins, diocesan exorcist for Hereford, to know if Zoe Mahonie is lying or deluded when she claims that the wrathful Susan Lulham is still in residence?

Then comes another bloody death. Who is the real killer?