First-class agents from FBI field office criminal division bring on their intellect and technical expertise to safeguard New York and the country against terrorism, organised crime and counterintelligence.
In the season four premiere, the team investigate the murder of a young woman, killed on her way home from a lavish yacht party. (S4, ep 1) Enhanced for UHD.
Maggie, OA and the team must stop a hacker who is disabling life-saving equipment in hospitals. Jubal's son waits for surgery. (S4, ep 2) Enhanced for UHD.
After the team finds a link between a spate of bombings a private veterans' club, Isobel tells OA to recruit his former Army buddy for intel. (S4, ep 3) Enhanced for UHD.
The team hunts for a serial killer who targets young, homeless men. Also, Tiffany and Scola don't see eye to eye. (S4, ep 4) Enhanced for UHD.
After a suburban wife is kidnapped from her home, the team looks into trysts on both sides of her marriage. OA feels pressure from Mona. (S4, ep 5) Enhanced for UHD.
The team must track down a shooter targeting detectives from the same precinct and unit, while facing mounting tension from the NYPD. (S4, ep 6) Enhanced for UHD.
After a girl is kidnapped from her daycare, the team must help her parents navigate a debt owed to a deadly gang. Maggie struggles to focus. (S4, ep 7) Enhanced for UHD.
The team attempts to extract key information from a vulnerable 9/11 widow. Meanwhile, Scola is reminded of his brother's death. (S4, ep 8) Enhanced for UHD.
After Rina is critically wounded while heading to work with Jubal, the team makes a chilling discovery. (S4, ep 9) Enhanced for UHD.
A string of jewellery store robberies are linked to a 16-year-old boy trying to survive the foster system. (S4, ep 10) Enhanced for UHD.
As the team searches for an abducted college co-ed, Jubal becomes fixated on obtaining a lead from the father of the abductor's previous victim. (S4, ep 11) Enhanced for UHD.
Maggie goes undercover working in a bar to investigate an anti-government group, but the case opens old wounds. (S4, ep 12) Enhanced for UHD.
Pride and Prejudice: When a Muslim college student and his younger brother are murdered, the team connects with the outraged imam of OA's former mosque. (S4, ep 13) Enhanced for UHD.
The team rushes to investigate an extremist gun group after an anti-gun lobbyist building is bombed, with the promise of others to follow. (S4, ep 14) Enhanced for UHD.
The team realises they have a cross-country killer on their hands after a body is found bound with the same tricky knot as their local victim. (S4, ep 15) Enhanced for UHD.
After an ICE agent is fatally shot at an ICE vs DEA hockey game, the team attempts to find the shooter. (S4, ep 16) Enhanced for UHD.
When a young couple is found murdered after returning from vacation, the team searches for a suspect linked to the drug trade. (S4, ep 17) Enhanced for UHD.
OA is forced to confront one of his biggest fears when the team discovers that deadly sarin gas may have been sold to terrorists. (S4, ep 18) Enhanced for UHD.
The team tracks the killer of a morning show host murdered inside her home. Things become awkward for Scola when Nina Chase joins the team. (S4, ep 19) Enhanced for UHD.
The murder of a TSA agent leads the team to hunt down a killer who is using drug mules to exploit airport security checkpoints. (S4, ep 20) Enhanced for UHD.
When a retired DEA agent is shot, the team works to determine if the victim's past cases or current job are connected to the murder. (S4, ep 21) Enhanced for UHD.