As the BAU welcomes back Emily Prentiss, they're called upon to investigate the disappearance of three women.
Castle and Beckett go under cover as newlyweds at an Old West-style resort to investigate a murder by poisoning.
The team searches for a killer in Miami who started out slaying animals and then quickly progressed to murdering prostitutes; Morgan asks Reid to join the bureau softball team.
The stakes get higher as May and Hunter pursue Ward and Hydra; Coulson thinks the ATCU could be keeping a big secret.
The spirit of a malicious young boy haunts his workaholic mother, who neglected to spend time with him while he was alive.