On this episode of Person of Interest…

An unassuming worker goes undercover as a detective, but his investigation gets him caught up in a battle between Elias and the Brotherhood.

While Reese and Fusco attempt to help Water, he also gets excited to finally be with the “Man in the Suit.”

Elias manages to get all the weapons and take out the Armoror before he confronts Dominic and the Brotherhood.

Walter is saved, also jumping in front of a bullet for Reese, and says he won’t tell Reese’s secret.

Finch travels to Hong Kong and meets Beth Bridges. He plants something in her computer.

Samaritan is interested in Beth’s algorithms.