Hercule Poirot arrives at The Hollow for a weekend luncheon just in time to see Gerda Christow standing, revolver in hand, over the body of her husband. It seems obvious that she has killed her wayward spouse, but Poirot doesn't believe things are that simple. What does Christow's death have to do with his current and former lovers, both of whom are nearby? What secrets are the weekend guests hiding in this case of love, deceit, mystery, and death?