When FBI Agent Emily Byrne returns after being presumed dead for six years, the investigation into her absence rocks the lives of her loved ones.

A witness linking Emily to a new murder victim threatens to separate Emily from her family once again.

When Emily’s prime suspect is shockingly murdered, can she and Nick prove her innocence before Tommy Gibbs and the BPD arrest her?

With no way to prove her innocence, Emily makes a choice that may keep her away from Flynn forever.

The hunt for Emily intensifies when one of the FBI’s own agents is found murdered, leading Nick to question everything about Emily and her return.

Emily returns to Boston but the only person who can help her may be the one seeking to destroy her.

Armed with new information surrounding her abduction, Emily’s investigation leads to her childhood – while Nick faces another tragedy.

While Emily edges closer to solving the mystery of her abduction, Nick is a man on fire, searching for Alice and Flynn who have been abducted.

With Nick and Tommy hot on her heels, Emily gets a critical lead from Jack that takes her back to where it all started.

Emily’s present and past collide in a climactic showdown – can she save Alice and Flynn and finally prove her innocence?