After rescuing her family, clearing her name, and returning to “normal” life, former FBI agent Emily Byrne (Stana Katic) is still riddled with guilt and self-doubt, struggling with the unknown of what truly happened to her during her years of captivity. Hungry for answers, Emily chases down leads with the help of BPD Detective Tommy Gibbs (Angel Bonanni) but only finds more questions.
When a homegrown terrorist attack rocks Boston, the city’s FBI Field Office springs into action to find the perpetrator. Special Agent Nick Durand (Patrick Heusinger) leads the search for the domestic terrorist, working alongside Special Agent-In-Charge Derek Crown (Christopher Colquhoun) and new profiler, Special Agent Julianne Gunnarsen (Natasha Little). Meanwhile, Emily’s investigation into her past becomes a hunt for a serial killer whose crimes have been overlooked in the citywide chaos. When the serial killer claims a victim close to Emily, she returns to the FBI to hunt him down, partnering with Special Agent Cal Isaac (Matthew Le Nevez) a former Navy SEAL with a personality that runs counter to Emily’s.
The FBI’s two investigations collide when it is discovered that there is a far bigger conspiracy at hand. The trail of clues amidst the global hunt will lead Emily back to her own fractured family – forcing her to overcome her past trauma and protect the ones she loves.