1 year after the dawning of synth consciousness, Leo is still in a coma leaving Max, Mia and Flash to broker an uneasy peace with the fearful human world. Laura's fight for synth rights receives an unexpected boost.

As Leo struggles to come to terms with being human, Mattie takes him back to the Hawkins' home, where a surprise night out allows them to confront their feelings for each other. Laura is determined to uncover the truth about the too-secret Operation Basswood and tries to enlist Dr Neil Sommer's help, only for things to take an unexpected turn. Joe reluctantly decides to help Karen with Sam, and Niska receives a mysterious message.

Laura leads a tense visit of the Dryden Commission to the Railyard, but Agnes's anger may threaten success. Mia confronts her past when she meets Ed. A night out turns to tragedy.

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Laura discovers a shocking truth that threatens her life and those around her. Leo and Mattie return to the Elster house where Leo comes to understand a painful truth. Niska continues her journey, where she must defy all her instincts to survive.

Max (Ivanno Jeremiah) must confront a friend turned foe. Laura (Katherine Parkinson) reels from her heartbreaking decision, but when Mattie (Lucy Carless) reveals her secret, she is spurred back into action. Niska's (Emily Berrington) journey takes an unexpected turn, while Leo (Colin Morgan) races to be by Max's side, but walks into danger.

It's a race against time to stop Basswood. Laura must put her reputation and life on the line if she is going to have any hope of saving the Synths, but is she willing to give up her family and her freedom? Niska has reached her journey's end, but when the source of the mystery is revealed, has her real journey only just begun? Mia, Leo and Max stand together in final battle, but will they make it out alive? When the world learns of the atrocities that are taking place, will the fate of Synths change forever?