Plot summary
The Machine's next number, wingman Andre Cooper, is discovered by Fusco to be preparing to testify against former mob associates who are now targeting him. Reese and Shaw rescue Fusco and Cooper from the mobsters' captivity. Finch and Root infiltrate a black market for weapons sales. Root subdues a group of Latvian gang members buying an AT4 anti-tank weapon; she and Finch uncover the mob's stash of money and weaponry, which they decide to use for their own work.
Credits
Adapted from Wikipedia contributors, Person of Interest season 4. HTML formatting and reference markers removed.