When a homicide case ends in a hung jury, Erin is forced to take over the case from her colleague and find a missing witness. Also, Jamie and Eddie go undercover as an elderly couple to catch a gang that is terrorizing a neighborhood.
Bull is asked to help a teachers union represent a woman who is being prosecuted by the DA for helping an impoverished student pass an important test, but who may be the scapegoat for a larger cheating scandal.
The detectives discover that a bicycle-theft ring may be connected to the disappearance of several adolescents.
