第 4 季 共 22 集
播出时间：2021年9月22日
第 1 集 All That Glitters (I)
播出时间：2021年9月22日
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. Also, Maggie brings Crosby into the investigation after a murder suspect is identified as a veteran who had been on several Army operations with Crosby.<br />
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The crossover continues on FBI: Most Wanted S03E01 Exposed (II) and FBI: International S01E01 Pilot (III).
第 2 集 Hacktivist
播出时间：2021年9月29日
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. With Jubal’s son waiting for important surgery at one of the impacted hospitals, Jubal’s adamant about remaining involved in the case despite Isobel’s reservations
第 3 集 Trauma
播出时间：2021年10月6日
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, for intel since he spends time at the club. However, knowing the difficulty soldiers like Chris often face returning to civilian life, OA is reluctant to follow orders
第 4 集 Know Thyself
播出时间：2021年10月13日
The team hunts for a serial killer who is targeting young, homeless men. Also, Tiffany and Scola don’t see eye to eye on how to handle the case or the difference between partners and co-workers.
第 5 集 Charlotte’s Web
播出时间：2021年11月3日
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.
第 6 集 Allegiance
播出时间：2021年11月10日
The team must track down a shooter targeting detectives from the same precinct and unit, while facing mounting tension from the NYPD. Also, Tiffany finds that her NYPD roots may be influencing her view of the situation.
第 7 集 Gone Baby Gone
播出时间：2021年11月17日
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; Maggie struggles to focus on the case when her sister returns from rehab.
第 8 集 Fire and Rain
播出时间：2021年12月8日
The team attempts to extract key information from a vulnerable 9/11 widow, Hannah Thompson, 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.
第 9 集 Unfinished Business
播出时间：2021年12月15日
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.
第 10 集 Fostered
播出时间：2022年1月5日
As the team investigates a string of jewellery 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. Tiffany becomes personally invested after learning about the boy's ill-fated upbringing.
第 11 集 Grief
播出时间：2022年1月12日
The team searches for an abducted college coed; Jubal has a tense encounter with Rina's mother.
第 12 集 Under Pressure
播出时间：2022年2月2日
Maggie goes under cover working in a bar to investigate an anti-government group that regularly gathers there; a single father on the periphery of the group begins to fear he's in danger of becoming collateral damage.
第 13 集 Pride and Prejudice
播出时间：2022年2月23日
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.
第 14 集 Ambition
播出时间：2022年3月9日
The team investigates an extremist gun group after an anti-gun lobbyist building is bombed; SAC Bashar dangles a possible promotion for OA.
第 15 集 Scar Tissue
播出时间：2022年3月23日
The team realizes they have a cross-country serial killer on their hands; the case has ties to Isobel's father, Robert, and his hotel, leading to revelations about their fractured relationship.
第 16 集 Protective Details
播出时间：2022年3月30日
After an immigration agent is fatally shot at a 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.
第 17 集 One Night Stand
播出时间：2022年4月13日
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.
第 18 集 Fear Nothing
播出时间：2022年4月20日
OA is forced to confront one of his biggest fears when the team discovers that deadly sarin gas may have been sold to terrorists.
第 19 集 Face Off
播出时间：2022年4月27日
When a morning show host is murdered inside her home, the team tracks the killer, who they realize is targeting powerful women. Also, things become awkward for Scola when Special Agent Nina Chase becomes part of the team during Maggie's recovery.
第 20 集 Ghost from the Past
播出时间：2022年5月11日
The murder of a TSA agent leads the team to hunt down a killer who is using drug mules to exploit airport security checkpoints. Also, OA struggles to cope with the aftermath of the sarin gas exposure and the 10th anniversary of his army friend's death in Afghanistan.
第 21 集 Kayla
播出时间：2022年5月18日
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. Also, Nina and Tiffany clash over the use of an informant while they are paired during the investigation.
第 22 集 Prodigal Son
播出时间：1970年1月2日
As the team investigates a deadly robbery that garnered a cache of automatic weapons for the killers, they discover one of the perps is a classmate of Jubal’s son, who is reluctant to cooperate.
