It was Danielle and Gracie's secret. A teenage adventure. A 1000 mile drive along the spine of the Rocky Mountains to visit Danielle's boyfriend in Montana. Their parents were never to know. But now the girls have simply vanished. The only person who knows they're missing is Danielle's boyfriend. He persuades with his father, an ex-cop, to search for them. But he too simply disappears. Its up to his new partner, war widow and single mother Cassie Dewell to find them. Her investigation will introduce her to FBI's Highway Serial Killer Task Force, force her to confront a spate of roadside sexual mutilations and murders and lead her into the lair of predator who styles himself The Lizard King.
