After facing adversaries from Reese’s undercover past and Finch’s contract work for the government, the team’s anonymous crime-fighting is constantly under threat. Meanwhile, NYPD Detectives Carter and Fusco must wrestle with the corrupt tentacles of the police conspiracy known as “HR.” At the same time, new threats against Team Machine come to light, including Vigilance, a watchdog group committed to exposing overreaching government surveillance methods, and Decima Technologies, who tried and failed to take control of the Machine in the previous season and are now going to extreme measures to bring another surveillance system called Samaritan online.