Dean is tormented by the sin he committed and loses his reason to fight. When he can't take the suffering anymore, Missouri pays a visit and hands him a photo which awakens old memories inside him. 15 years ago, Ryle, a teacher at the school Sam and Dean were attending, became a mother like figure for the brothers and a member of the Winchester family. However, Dean remembers their mother, Mary, and can't idly accept Ryle. Ryle had a secret that even John didn't notice.