Black House - Stephen King

Twenty years ago, a boy named Jack Sawyer traveled to a parallel universe called The Territories to save his mother and her Territories "twiner" from a premature and agonizing death that would have brought cataclysm to the other world. Now Jack is a retired Los Angeles homicide detective living in the nearly nonexistent hamlet of Tamarack, WI. He has no recollection of his adventures in the Territories and was compelled to leave the police force when an odd, happenstance event threatened to awaken those memories.