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.

Jack helps save Emily’s life and finds a startling connection with Emily’s childhood. Emily discovers secrets from the past that relate to a childhood friend, Charles. Meanwhile, Tommy arrests Jack for helping Emily. Alice confronts Nick, which puts both her and Flynn in danger.

Emily and Cal venture off the grid as they track Rex Wolfe deep into lawless territory. Back in the States, Nick struggles to swallow a massive lie.

Emily is forced to deal with another devastating loss. However, her grief soon transforms into drive when she realises Rex Wolfe was only the tip of the iceberg.

Emily makes a final attempt to trade the stolen files for Nick and demands proof that he is alive, unaware that Nick has escaped from his captors in a thrilling chase. Nick makes contact with the FBI, and Emily makes a bold decision to confront Cal about his past.

Emily and Nick are finally reunited with Flynn back in Boston, but the threat of Elliot’s bioweapon still looms large. Emily resorts to drastic measures and make a dangerous choice to ensure her family’s safety.