One spring evening, all of the residents in the rural town of Calliope, Nebraska are murdered. There are no witnesses and there were no calls for help.
The nearest town is 30 miles away and Sheriff Evelyn Hartley has to bear the burden of the case. Hartley, a single mother who lost her child months before in a freak accident, becomes obsessed with finding the only two missing citizens of Calliope, a pair of young siblings. When the FBI pushes her out and talk of terrorism looms, Hartley has to work on her own to make sure it doesn’t happen again, somewhere else.