While on a scouting mission to inspect trail damage, officer Mattie Cobb and her K-9 partner Robo find a body floating at the edge of a lake. Robo catches human scent, which leads leading to a forest-dweller becoming victim one. With help from veterinarian Cole Walker, Mattie identifies the victim, and discovers an odd religious cult reminiscent of the 19th century. As the list of suspects grows, an unexpected visit from members of Mattie's long-lost family sheds new light on her childhood as they help Mattie piece together details of the fateful night when she was abducted at age two.
