The team is on the case when a suburban couple is murdered and all forensic evidence points to the home's previous owner, who is currently serving 10 years in federal prison.

The investigation into an assistant U.S. attorney’s death leads the team to a related airline whistleblower scandal and the chilling discovery that they don’t have much time to thwart terrorists from crashing numerous in-flight commercial airplanes. Dealing with the memory of his brother, who was a 9/11 victim, the case pushes Scola hard to prevent another catastrophe.

When a CEO is killed by a targeted explosion inside his penthouse, the team must work to figure out how someone accessed the highly secure building. Their task is further complicated when they discover the crime may be the work of an artificial intelligence program. Meanwhile, Maggie pumps the brakes on her personal life.

When two IRS special agents are stabbed to death in Brooklyn, the team is thrown into an investigation that leads back to the resurgence of the online conspiracy community of Duke Ducoyle, their suspect from a previous case.