Carpenter's Gothic finale

After finishing the book, I felt that I didn't understand the ending that well. It seemed to me that at the end of the book, Liz was killed by someone in the suburbs, because the newspaper says "Heiress Slain In Swank Suburb". I think that this occurred after she went to visit her brother. I believe that she was killed, because someone had found out about her inheritance and wanted the money for themselves. I also had a feeling that Paul was going to kill someone by the end of the book, because he was always angry and yelled at his wife for no reason. I think that Paul felt devastated after Liz was killed and he blamed himself for her death. Overall I felt that this book would have been easier to understand if it was written like a normal book. I hope that the other two books we read are easier to understand.