When a scared, emaciated young boy is found in the Arizona desert and another boy winds up missing, the BAU begins searching for the kidnapper as Morgan, reaching into his own scarred past, tries to bond with the found child.

When Morgan's sister sees a woman who looks like their presumed-dead cousin, Cindi, it forces Morgan to confront a lie he told his family last year to provide closure and compels the BAU to reopen the case of her disappearance.