Sarah fights for her life on the Island and tries to stay strong enough to rescue Cosima; Cosima and Delphine reunite.
Sarah sets out to bring down Neolution once and for all.
Helena takes shelter behind enemy lines, and Sarah and Art struggle to protect her and end the siege.
Sarah and Kira spend time at home; secrets are unlocked about Kira's gifts; Cosima joins Delphine at the mansion.
Alison's loyalty to the clones is questioned; Cosima makes a final attempt to discover a cure.
