The series tells the story of FBI agent Emily Byrne who, while hunting one of Boston’s most notorious serial killers, disappears without a trace and is declared dead.

When a homegrown terrorist attack rocks Boston, the city’s FBI Field Office springs into action to find the perpetrator. Special Agent Nick Durand leads the search for the domestic terrorist, working alongside Special Agent-In-Charge Derek Crown and new profiler, Special Agent Julianne Gunnarsen.

Several months after the events of Season 2, Emily Byrne is reaching the end of her FBI suspension while working hard to be the best possible mother to Flynn. But when an international criminal case hits too close to home and threatens the family, everything changes.