After buying a run-down house near a local canal, Edward Collier is only vaguely aware of the fate of its previous occupant – an apparent drowning accident. One evening, not long after he moves in, he witnesses something which tilts his sanity on its head. He keeps quiet about the incident until he befriends Joseph, an elderly local fisherman, who tells him that he personally knew the former owner of the property. He relates a story of a fishing trip to the Shetland Islands, the consequences of which ended a man's life. Because something followed them back... From the quiet inland waterways of Birmingham, to the lochs and cliff-faces of the Shetland Islands, John Merritt's macabre tale of two fishing buddies who stumble across an ancient and deadly form of the natural world – first thought to be the stuff of myth and folklore – will make you think twice before you put on your waders...