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1786: Joseph Bloxham is a self-made man and something of a star in fashionable coffee-house society. Some, though, like the sceptical Noakes, take a dim view of his shady business ethics. Bloxham has used his ill-gotten gains to obtain the old Geap Manor, paying no heed to the warnings of Noakes and his friend Duncalfe. But when Bloxham begins hearing ghastly sounds in the newly-installed panelling of his drawing room, it seems he might have more than just a mouse hiding in his wainscoting.

1927: Lady Constance de Momery presides over a costume ball for her grandson Felix. However, all is not as it seems and when the young heir to the estate announces his engagement to sweetheart Ruth, his friends Billy and Katherine are far from pleased.

Back in the present day, commitment-shy Ben begins to discover that, though demolished, Geap Manor casts a long shadow. Having recently left his girlfriend Hannah for a life of excitement over cosy domesticity, he is excited by the curator's stories and screws the ancient door knocker to his new front door. However, Ben soon finds himself getting more excitement than he bargained for as the past begins to intrude rudely with a loud nightly knock and a terrifying journey into the Manor's bloody past.