The Haunting and Eldritch Manor

The Haunting and Eldritch Manor is a paranormal-fantasy novel where the hero is murdered in the opening scene and spends the book fighting to reclaim his life with his new bride, María, who he hasn't met-much less married-while a dimensional-traveling, murderous alien and a demon situated inside its self-shaped world try to stop him and exterminate all life on his version of Earth.