It's Officer Aaron Thorsen's first day back since the assault, and he's tasked with a series of high-stress cases to determine whether he's ready to work. Elsewhere, the team investigates a homicide case with a potential tie to the pentagram killer.

Following their time as foster parents, Bailey has decided she wants to have a baby and forces John to reconsider their decision to not have children. Meanwhile, John and Celina discover a prison escapee who they fear is out for revenge and race to find her before it is too late.