The team welcomes a new member as they begin their hunt for a repeat offender and the child he kidnapped after murdering the boy's single mother; Jess tries to move past the awkward exchange he had with Sarah during their last encounter.
When a teenager is found dead, Rollins must go undercover at a rehab clinic where she was last seen alive. Meanwhile, Benson attempts to move past her doubts about Sheila.
Eddie and Jamie believe foul play is involved when they respond to a woman's distress call regarding an allergic reaction.
Dalton is faced with the demons from his past to secure the journey home. Stevie takes over Russell's social media. Henry helps his niece.
Dr Halstead treats a former high school classmate. Doctors Manning and Charles try to treat a young patient who refuses to take medication.