Joshua Tree National Park Ranger Charlotte arrives on the scene of a car accident caused by a large dog tearing across the road. The third sighting of the animal in as many weeks, Charlotte's interest is piqued. Armed with a bowl of dog food and a bucket of patience, she sets out to find the beast. With the grille marks of a sedan imprinted on his broken ribs, Alex returns to the scene of the accident, scouring for prints he'd left behind when he encounters Charlotte on the trail. The attraction is undeniable, but Alex is on a mission from Hades and can't afford the distraction. While Charlotte continues to gain the trust of the wild dog roaming the park, Alex is caught between the woman he's falling for and the job he was sent to do. With bodies and secrets piling at his feet, Alex is pushed to choose between the hellhound he is and the man he wants to be.