The residents of the Scottish town of Tarn-Na-hay find themselves in a terrifying situation as the ground beneath there feet begins to move, and hideous monsters emerge seeking food...Based on the Scottish Folklore tale of The Yird Swine

The remote Scottish Town of Tarn-Na-Hay has a problem: sink holes are appearing across their forest which is leading to a decline in tourism. Not only that but also coffins are being dug up from the local graveyard and appearing all over the place. Desperate, the town has hired the services of Environmental Surveyors to assist in solving the problem - however it soon becomes clear that this mysterious is far more sinister than originally thought, and that ancient and terrifying creatures are moving under the very ground..—Douglas Kyle