Brigid Hawking is the 'Van Helsing of ghost hunters' and has built a career debunking fraud and chasing the very real apparitions of entities and forces from outside accepted reality. In the town of Whitby, on the coast of Yorkshire, she and other ghost hunters rendezvous in uneasy truce to monitor the mother of all hauntings, as something unprecedented happens: a correlation between paranormal events and an observed phenomenon of the planetary magnetic field.
Here she meets Mel Jenkins, a monitor for the British Parapsychic Network, and they pool their resources both to chase their personal demons and to explore their immediate and passionate attraction. Against a background of haunting and apparition, and the texture of a quaint sea-town from the days of sail, their love blossoms with the urgency of their needs, and the terrible presence of something evil, something that has stalked Brigid all her days and may have taken those she most loved from her.
In a place with a centuries-long reputation for the strange, where hell-hounds howl a death-knell and ghosts hurl the living to their doom, now the Unseen breaks through as never before. Brigid and Mel are at ground zero of a volcano of the paranormal that will silence sceptics, rewrite textbooks and overturn the modern perception of death and reality.
But this is not just about demonstrating the reality of the paranormal world. For Brigid and Mel alike, it's entirely personal -- and very possibly lethal.