Plot summary
Harold is summoned for jury duty in the trial of a man charged with murdering his wife, the former CEO of a cellphone development company. Harold provokes the judge to get rejected from the panel, but is brought into it anyway. He is seated next to a former schoolteacher named Emma ( Blair Brown ), who turns out to be The Machine's next number. The team initially concludes that she is a perpetrator, being coerced to "fix" the trial; but later realizes she is supposed to convince the jury to vote "guilty".
Harold stalls to get a "not guilty" verdict while Reese and Zoe Morgan try to deduce the real story. The jury is sequestered in a hotel, and one of the jurors attempts to kill Harold, but Reese intervenes. The man is actually a plant by the real perpetrator, the new CEO of the company. The murder was to prevent the dead CEO from withdrawing an expensive product which was deemed to be unsafe. The new developments lead to dismissal of charges, and the real perpetrator is arrested. Fusco tells Reese to stop shutting him out. Zoe realizes there's a growing attraction between Reese and his counselor.
Credits
Adapted from Wikipedia contributors, Person of Interest season 4. HTML formatting and reference markers removed.