After an Amber alert goes past the critical 24th hour without success, a woman known to JJ claims this current case is identical to her son's disappearance eight years ago. But it's a claim she has made numerous times over the years. JJ uncovers a crucial link between the cases which makes her believe there's a connection and she persuades the team to investigate. To the horror of our BAU team, they discover the owners of a crematorium have been abducting children and keeping them alive for over ten years.