A New York Times Bestseller -- One question a split-second decision and Brian Darby lies dead on the kitchen floor His wife state police trooper Tessa Leoni claims to have shot him in self-defense and bears the bruises to back up her tale For veteran detective D D Warren it should be an open-and-shut case But where is their six-year-old daughterAs the homicide investigation ratchets into a frantic statewide search for a missing child D D Warren must partner with former lover Bobby Dodge to break through the blue wall of police brotherhood seeking to understand the inner workings of a troopers mind while also unearthing family secrets Would a trained police officer truly shoot her own husband And would a mother harm her own childFor Tessa Leoni the worst has not yet happened She is walking a tightrope with nowhere to turn no one to trust as the clock ticks down to a terrifying deadline She has one goal in sight and she will use every ounce of her training every trick at her disposal to do what must be done No sacrifice is too great no action unthinkable A mother knows who she loves And all others will be made to pay.