While responding to a call of shots fired at a familyresidence, Lindsay and Halstead discover the only survivor isthe youngest daughter who is traumatized. While Lindsay and Dr.Charles evaluate the girl and see if she can help identify thekiller, Antonio and Olinsky look into a pyramid scheme"self-help" group for potential suspects.Meanwhile, Platt tries to make the case to Commander Crowleyfor Burgess and Roman to remain partners.