The House on the Borderland in Bloomington, MN

Hodgson wrote a trilogy consisting of Date 1965 Modern Warfare, The House on the Borderland, and The Ghost Pirates. The setting for The House on the Borderland is an ancient house in a lonely part of Ireland, where an old man lives alone with his sister and his pets. His diary is found and it tells the story of a huge cavern below the house filled with white pig like monsters