Green River is a psychological thriller about a woman seeking closure with her sister's disappearance. Charisma Kavanagh and her friend Allison Chase return to Green River, the last known whereabouts of Charisma's sister. They encounter Jack Walker, a mysterious local man who arouses suspicion in Allison. As Allison becomes increasingly paranoid and dangerous, Charisma is forced to choose between trusting her life with her friend or a stranger.