15. Blue Code

Complete story — includes the ending

Reese and Finch discover their latest POI, Michael Cahill, to be secretly involved in a ruthless smuggling ring led by a man named Vargas. Reese infiltrates the ring and learns that Cahill is in fact an undercover cop formerly named Daniel Tully, and has held off on arresting Vargas in hopes of apprehending his superior. Reese learns that Vargas may have a connection inside the NYPD; Fusco attempts to locate the connection via his friend, corrupt police officer Patrick Simmons, but is later taken hostage by Vargas' corrupt informant, whom Reese kills in time. Reese tasks Fusco with going undercover in "HR" – a secretive network of corrupt NYPD officers – to learn more about their operations. Flashbacks show Reese and Kara in New York, illegally operating on U.S. soil. Reese meets his girlfriend Jessica's husband Peter Arndt at a bar, but leaves before Arndt can "introduce" him to Jessica.