Taylor enlists Oliver to help her carry out a scheme so she can ditch her less cool friend Ellen and go to a concert with her "blondetourage." Meanwhile, Katie is devastated when Anna-Kat doesn't need her as much anymore, which causes Katie to make some poor and desperate parenting decisions.

When a series of backyard pool homicides are reported in California, the BAU team searches for an UnSub with a puzzling past.

Emotions run high as the squad embarks on a frantic search for Benson’s missing son.

Claire’s request to build a “She Shed” in their backyard is denied by the homeowners association. Pameron lets Cam in on a family secret that forces him to visit Mitch’s therapist to work through this new information.

Jimmy convinces Maya to go on a much-needed night out together where they drink through Maya's urge to rush home to the kids. Back at the house, Ray and Kenneth avoid being alone with their dates, while JJ, sidelined by a broken wheelchair, ends up getting more excitement than he expected. Meanwhile, Dylan spends her night trying to win the affection of the new family dog.

Liz abandons her old life and seeks out a fresh start in a place where no one knows her history, her name, or the depths of her grief. When an unexpected threat finds her, she is forced to draw on her emotional and physical strength in a brutal fight for survival.

When dissension threatens the group, Baird takes the Librarians to a charismatic self-help guru’s team building camp on the edge of a forest where people have been mysteriously disappearing. Is there a monster in the woods? Or is something more sinister going on? And can the Librarians get their team mojo back in time to defeat it?

Bjorn returns to Kattegat to learn that an attack will take place during the next full moon; Ivar must decide if he can place his trust in a former enemy on the battlefield.