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- Season 4 overviewSep 21, 2021-May 23, 202222 episodesSeason 4 episodes22. Prodigal Son May 23, 2022
- Killers in New York loot an arsenal of fully automatic weapons.
- 21. Kayla May 17, 2022
- A retired Drug Enforcement Administration agent is shot outside a bakery.
- 20. Ghost From the Past May 10, 2022
- A killer is using drug mules to exploit airport security checkpoints.
- 19. Face Off Apr 26, 2022
- When a morning show host is murdered inside her home, the team tracks the killer.
- 18. Fear Nothing Apr 19, 2022
- OA is forced to confront his fears when the team finds deadly gas may have been sold to terrorists.
- 17. One Night Stand Apr 12, 2022
- A young couple is found murdered in a New York City park after returning from a vacation.
- 16. Protective Details Mar 29, 2022
- After an immigration agent is fatally shot at a hockey game; the team attempts to find the shooter.
- 15. Scar Tissue Mar 22, 2022
- The team realize they have a cross-country serial killer on their hands.
- 14. Ambition Mar 8, 2022
- The team investigates an extremist gun group after an anti-gun lobbyist building is bombed.
- 13. Pride & Prejudice Feb 22, 2022
- The imam of OA's former mosque insists murdered Muslims were wrongly targeted as terrorists.
- 12. Under Pressure Feb 1, 2022
- Maggie goes under cover working in a bar to investigate an anti-government group.
- 11. Grief Jan 11, 2022
- The team searches for an abducted college coed; Jubal has a tense encounter with Rina's mother.
- 10. Fostered Jan 4, 2022
- The team investigates a string of jewelry store robberies that culminate in a double murder.
- 9. Unfinished Business Dec 14, 2021
- The team makes the chilling discovery that a vengeful Vargas orchestrated the shooting.
- 8. Fire and Rain Dec 7, 2021
- A widow is shocked that her new "boyfriend" is the manipulative leader of a terrorist group.
- 7. Gone Baby Gone Nov 16, 2021
- A young girl is kidnapped from her daycare; Maggie struggles when her sister returns from rehab.
- 6. Allegiance Nov 9, 2021
- The team must track down a shooter targeting detectives from the same precinct and unit.
- 5. Charlotte's Web Nov 2, 2021
- A suburban woman is kidnapped from her home; OA feels pressure to make changes in his career path.
- 4. Know Thyself Oct 12, 2021
- The team hunts for a serial killer who is targeting homeless men; Tiffany and Scola are at odds.
- 3. Trauma Oct 5, 2021
- The team finds a connection between bombings and a private veterans' club in New York City.
- 2. Hacktivist Sep 28, 2021
- The team must stop a hacker who is disabling life-saving equipment in several hospitals.
- 1. All That Glitters Sep 21, 2021
- A young woman is killed on her way home from a lavish yacht party.