Lucas Davenport has seen many terrible murder scenes. This is one of the worst. In the Minnesota town of Wayzata, an entire family has been killed—husband, wife, two kids, dogs. On the wall, in blood: “Were coming.” No apostrophe. There’s something about the scene that tugs at Lucas’s cop instincts—it looks an awful lot like the kind of scorched-earth retribution he’s seen from Mexican drug gangs. But this is a seriously upscale town, the husband ran a modest software company, the wife dabbled in local politics. None of it seems to fit.