While patrolling the forests of the Wind River Indian Reservation, U.S. Fish and Wildlife agent Cory Lambert comes across a dead body. He alerts the FBI, who send rookie agent Jane Banner to investigate. But Banner is ill-prepared for the rugged terrain of the wilderness. She must rely on Lambert to see her through the forests, and he must rely on her to find a murderer. Between the harsh elements and the violence that awaits them, surviving the ordeal could prove impossible.