Major crimes intersect in this nail-biting installment of the Timber Creek K-9 mysteries by award-winning author Margaret Mizushima.

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.

As the team gathers evidence and information, Mattie's husband, veterinarian Cole Walker, notices suspicious activity during ambulatory calls at dog kennels, indicating yet a third crime lurking in the shadows. What begins as isolated incidents quickly reveals a chilling truth: organized crime has infiltrated their rural mountain community.

Every clue leads to more questions, and each answer brings them closer to greater danger. Do Mattie and her law enforcement partners have what it takes to shut down this criminal ring before it claims more victims? And could its next victim be someone Mattie loves?