After years of assuming FBI Agent Emily Byrne was a possible victim of serial killer Conrad Harlow, she is miraculously returned to her family. Emily, however, has to struggle with the mysteries of her captivity and the fact that everyone has moved on without her.

Emily’s alleged serial killer, Conrad Harlow, is being released from jail, and Emily has not come close to solving the mystery of her kidnapping and time in captivity. As Emily struggles to return to normal life, a witness turns up and reinforces the suspicions of Emily. Emily denies the suspicions and is sure the witness is lying and was forced into making a false statement.

When the testifying witness against Emily is murdered, all signs suggest that the murder was committed by Emily. While Tommy Gibbs and the Boston Police Chief are accusing Emily, she and Nick look for an FBI agent who forced the witness to lie. For Emily, there is suspicion that this agent is the one responsible for her abduction.

The evidence against Emily is too much for the FBI and Boston Police Department to ignore, so they ask her to turn herself in. In the midst of chaos, old feelings come to the surface between Nick and Emily. Emily decides she would rather flee and try to solve the mystery that is ruining her life.

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.

After narrowly escaping from the authorities, Emily returns to Boston to find that 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 – will their investigations destroy them?

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?