A routine welfare check becomes a nightmare when Deputy Mattie Walker finds a young mother dead and a hysterical toddler, possibly the only witness to a brutal crime. Before the investigative team can start piecing together what happened, Mattie discovers another criminal act in Timber Creek.

During a traffic stop for speeding, Mattie observes a nervous driver and a teenage passenger frozen with fear. A quick sweep of the car with her K-9 partner, Robo, reveals a dangerous mix of drugs and suspected human trafficking, providing Mattie with grounds to arrest the driver. After she places the teenager in protective custody, the sheriff’s department hands the case over to the Colorado Bureau of Investigation.