Experienced profiler Stephen Walker joins the team as they look for a killer in Yakima, Washington, after the remains of twelve people are found lying in a creek.
The team is called in to find three children who went missing during a bike ride and may be connected to an unsolved crime from thirty years ago.
The team heads to the Appalachian Trail in rural Virginia in search of a serial killer operating around it. Meanwhile, Reid is faced with a dilemma involving his mother's health.
Prentiss rejoins the team to help them solve the murders of two single mothers who were found incased in barrels of concrete.
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