It's a race against time as Reese and Finch try to get the dying Machine to the subway station so that they can decompress it to a server capable of holding its memory. Meanwhile, Root turns to an old friend for identity papers as Decima agents close in on her, and Fusco deals with IAB in the aftermath of Dominic and Elias's deaths.

Past and present collide when the team's newest Number is investigating the death of his brother... who Reese killed when he worked for the CIA.