When the Cutter familys next-door-neighbours, the Langleys, are gunned down in their house one hot August night, the Cutters world is turned upside down. That violent death should have come so close to them is shocking enough in suburban Promise Falls, but at least the Cutters can console themselves with the thought that lightning is unlikely to strike twice in the same place. Unless, of course, the killers went to the wrong house?