The battered body of a five-year-old girl in foster care is discovered, and suspicion soon turns to the girl's foster brother, who is into violent video games and doesn't seem quite right in the head. The investigation turns to the girl's biological mother as well as to her foster mother and grandmother as the team tries to figure out who is the real guilty party, and who is only a red herring.
Max's career is on the line when Ben is brought in following a heroin overdose as Jack's brother helps save Spencer when he is attacked by an irate man.