When a bus explosion kills several innocent people, the team jumps into action to take down the responsible terrorist organization. Meanwhile, Scola tries to balance fatherhood with the job.

When a local club owner is found dead, the team works quickly to find the motive behind the murder of a seemingly innocent man. Meanwhile, OA is smitten with a new love interest but is concerned that she's mixed up with the wrong crowd.

When a federal judge is gunned down execution-style in broad daylight, the team is sent looking for a suspect with ties to a local Islamic center. Also, Maggie reunites with a former colleague while things become tense between OA and his girlfriend Gemma.

When the director of a Brooklyn migrant center is abducted and held hostage along with his wife, the team must work quickly to meet the demands of their kidnapper. Also, Maggie picks Jessica's brain about motherhood.

After multiple people are targeted and killed with a poisonous gas in broad daylight, the team races to find the killer, who they believe is tied to an eco-terrorist plot. Meanwhile, Maggie continues to explore motherhood.

When a bombing at a local restaurant leaves several injured or dead, including a congresswoman and someone close to Isobel, the team races to apprehend the suspect before another explosive goes off.

After an employee of the U.S. Army is shot in an industrial park, the team works to track down the killer who reveals a larger plot at play. Meanwhile, Tiffany continues to struggle with the guilt surrounding Hobbs' death.

When a retired FBI agent is tortured and killed while working a security job, Scola and Nina go undercover as a married couple deep in the diamond game as the team tries to find out who is responsible. During the course of his and Nina's dangerous assignment, Scola is plagued by the possibility that their son Doug could end up parentless.

After an FDIC security guard is killed while tending to a pregnant woman in distress, the team works to locate the woman and the killer who took her hostage. Meanwhile, OA and Isobel worry about Maggie as she navigates taking care of Ella.

The team is thrown into a highly political case after four members of the Taliban are shot and one is kidnapped in New York with no record of their entrance into the country. Having served in the U.S. Army, this case hits close to home for OA, who struggles to open up to Gemma about his past in Afghanistan.

When a truck driver is murdered and the drug he was transporting goes missing, the team hunts for those behind the remaining batch that is already wreaking havoc on the streets of New York.

The Somalian terrorist group behind the death of Agent Hobbs resurfaces, sending the team on a chase to take them down for good.