When a brutal murder shocks a quiet Texas town, all signs point to a cold-blooded killer in a black Cadillac with tinted windows and no plates. With no witnesses, no pattern, and no end in sight, Rangers Baker and Tate race across the Texas heartland, trailing a ghost on wheels who always seems to stay one step ahead.

When Caleb Vance — a magnetic national figure credited with helping elect the President — is brutally murdered in front of his wife and children at a packed outdoor forum, his killer's manifesto spreads like wildfire online, inspiring a string of copycat attacks. Rangers Baker and Tate race to stop a cycle of bloodshed fueled by obsession, fear, and the deadly lure of internet fame.

A derailment exposes a trafficking pipeline that has been moving human cargo through the heartland for years — and another train departs in hours, carrying children who will disappear forever if it reaches its destination. Ruth boards it, and now she and Aaron are trapped on a speeding train full of killers where there are no scheduled stops, only scheduled deaths.

One ridge. One outgunned drifter. One last stand against people who do not leave witnesses.