The Unopened Door — Brian Milligan

Bennett Myer, after writing his first book on being severly bullied in school, is ready to move on with life and dive into young adult fiction. His best friend Toni, who always looked out for him in high school, uses her real estate prowess to find Bennett the perfect house where he can begin his new novel. Almost immediately though, the house brings Bennett back to a world of isolation and terror. As he finds a mysterious door in the house, a demonic realm is opened that makes Bennett and his friends question reality itself.