As a double murder investigation digs up some bad memories for Voight, Burgess returns to work.
Reese and Shaw rush to catch up with Finch after he infiltrates a maximum security government facility in a bold and dangerous attempt to destroy Samaritan.
The team investigate a nine-year-old psychopath who's been torturing his sister. But when events escalate, Amaro's life is thrown into danger.
After a member of the President's staff is murdered, Ellen urges Duncan to back out of the assassination plot, but Duncan is certain that he's already in too deep.
Duncan locks the Sanders family in a room for the day while he and his team head to New York to eliminate the sniper team targeting President Kincaid.