I am a very big fan of Mary Higgins Clark. This is another very good book by her. When Kerry Dowling is murdered after a party she had, the first person blamed is her boyfriend, Alan. He swears he didn't kill her. Her neighbor, who is mentally challenged, witnesses a "Big Guy" hit her and push her into the pool. Kerry's sister, Aline is trying to help the police find the real killer, because deep down, she doesn't believe Alan killed Kerry. This is a page turner from beginning to end.