Survivor in Death by J.D. Robb

The members of the Swisher family were murdered in their beds with brutal, military precision. The state-of-the-art security was breached, and the killers used night-vision equipment to find their way through the cozy, middle-class house. Clearly, Dallas is dealing with pros. It seems the only mistake they made was to overlook the nine-year-old girl cowering in the darkened kitchen.  Now Nixie Swisher is an orphan-and the sole eyewitness to a seemingly inexplicable crime.