Season 4
Episode Guide
All That Glitters (Part 1)
S4
E1
After a young woman is killed on her way home from a lavish yacht party, the team investigates who she was and how she came to be at the event, which was attended by some of the most influential people in the world.
Hacktivist
S4
E2
Maggie, OA and the team must stop a hacker who is disabling life-saving equipment in several New York City hospitals, while demanding a full investigation into the recently deceased patients of a local psychiatric facility.
Trauma
S4
E3
After the team finds a connection between bombings at government agencies and a private veterans' club in New York City, Isobel tells OA to recruit his former Army buddy, Chris (Cleveland Berto), for intel since he spends time at the club.
Know Thyself
S4
E4
The team hunts for a serial killer who is targeting young, homeless men.
Charlotte's Web
S4
E5
After a suburban woman is kidnapped from her home, the team looks into trysts on both sides of a seemingly perfect marriage. Also, OA feels pressure from Mona to make changes in his career path.
Allegiance
S4
E6
The team must track down a shooter targeting detectives from the same precinct and unit, while facing mounting tension from the NYPD.
Gone Baby Gone
S4
E7
After a young girl is kidnapped from her daycare, the team must help her parents navigate a debt owed to the deadly gang in their neighborhood.
Fire and Rain
S4
E8
The team attempts to extract key information from a vulnerable 9/11 widow, Hannah Thompson (Janel Moloney), who is shocked that her new "boyfriend" is the manipulative leader of a terrorist group planning an attack. Also, Scola is reminded of his brother's death on 9/11, and Tiffany worries about his emotional choices during the investigation.
Unfinished Business
S4
E9
After Rina is critically wounded while heading to work with Jubal; the team makes the chilling discovery that a vengeful Vargas orchestrated the shooting from behind bars and continues to target the rest of their team and their loved ones.
Fostered
S4
E10
As the team investigates a string of jewelry store robberies that culminate in a double murder, they uncover a connection to a 16-year-old boy trying to survive the foster care system.
Grief
S4
E11
As the team searches for an abducted college co-ed, Jubal becomes intent on obtaining lifesaving leads from the father of the abductor's previous victim.
Under Pressure
S4
E12
Maggie goes undercover working in a bar to investigate an anti-government group that regularly gathers there and has several members suspected in a series of bombings.
Pride and Prejudice
S4
E13
When a Muslim college student and his younger brother are murdered, the team connects with the outraged imam of OA's former mosque, who insists the victims were wrongly targeted as terrorists.
Ambition
S4
E14
The team rushes to investigate an extremist gun group after an anti-gun lobbyist building is bombed, with the promise of others to follow.
Scar Tissue
S4
E15
The team realizes they have a cross-country serial killer on their hands, after another body is found bound with the same sophisticated knot as their local victim.
Protective Details
S4
E16
After an ICE agent is fatally shot at an ICE vs. DEA hockey game, the team attempts to find the shooter who they believe may also be targeting Congressman Curtis Grange, who was at the same game.
One Night Stand
S4
E17
When a young couple is found murdered in a New York City park after returning from vacation, the team searches for a suspect linked to the drug trade. Also, Scola turns over a new leaf when it comes to his relationships.
Fear Nothing
S4
E18
OA is forced to confront one of his biggest fears when the team discovers that deadly sarin gas may have been sold to terrorists.
Face Off
S4
E19
When a morning show host is murdered inside her home, the team tracks the killer, who they realize is targeting powerful women.
Ghost from the Past
S4
E20
The murder of a TSA agent leads the team to hunt down a killer who is using drug mules to exploit airport security checkpoints.
Kayla
S4
E21
When a retired DEA agent is shot outside a bakery, the team works to determine if the victim's past cases or current bouncer job are connected to the murder.