Sarah reels from a shocking discovery, and becomes desperate to find answers; after following a lead, Sarah finds herself in a harrowing encounter.
Sarah and Rachel must come together for the greater good; Cosima and Susan disagree about the ethical implications of human experiments.
Mrs. S. and Sarah set out to investigate a lead on a Neolution defector; an unexpected reunion takes place; Cosima has a terrible discovery.
Alison's loyalty to the clones is questioned; Cosima makes a final attempt to discover a cure.
Sarah takes the day off to reconnect with Kira; Cosima infiltrates an exclusive Neolutionist fertility research center and makes a shocking discovery of their clandestine experiments.
