When a Texas prisoner escapes during a transfer, he leaves behind victims with his unique trademark, sewing their mouths shut, a signature the BAU remembers as unique to the UnSub "The Silencer." While they investigate who he was and who he's become, the BAU also gets to know the newest member of the team.

When one Kansas family turns up dead and another goes missing, the BAU looks for a link between the cases to find out who is behind the kidnappings and murders. Also, Hotch gets surprising news from Beth.