When Walter, one of the Happy Trials residents, a healthy eighty-year-old who'd just been given a clean bill of health by his doctor, suddenly dies of a heart attack, Harriet feels like something isn't quite right about his death. Walter had been quite the ladies man. Could someone have killed him? Or did he just have a heart attack? A week later, another resident dies, and then a few days after that, another dies. What's going one? Why are healthy...