Harry_Hamilton_

The one with the haunted apartment looks cool. U can also add that the protagonist is mentally ill and leave to the reader to decide if all that is actually happening is really happening or just a figment of his imagination.
          
          I have just launched another book Justice Has A Name. Give it a read and thank u already.
          
          If its horror, u can search for that book in my reading list about writing good horror novels. It helped me too. Kudos on new book.