With Reese in FBI custody, Finch poses as a high school teacher to protect the next number, a teenager named Caleb Phipps . A seemingly below-average student, Caleb is hiding the fact that he is a genius.

Wanting to unearth Finch’s secrets, Reese watches him as he takes a call. But it’s just a new POI: Henry Peck , an NSA security analyst. Someone is after Peck for unwittingly discovering the existence of the Machine in a security report.