Holmes and Watson assist the NYPD as they search for a serial bomber terrorizing the city; Watson turns to a former criminal, whose life she saved during her time as a surgeon, for help.
Elizabeth discovers that a terrorist bombing at an Illinois coffee shop was funded by someone with close ties to the Saudi government.
Having taken on new identities provided by Root, the team members try to adapt to their new lives. When some find it difficult to ignore the machine's numbers, they put everyone at risk of being found by Samaritan.
Lawyers Maia Rindell and Diane Lockhart join one of Chicago's pre-eminent law firms after a financial scam destroys Maia's reputation and wipes out Diane's savings.
The trial of a gang member accused of killing an innocent girl takes a turn when the murder weapon is found. Stone's obsession for justice endangers the family of a cooperating witness.