Sarah fights for her life on the Island and tries to stay strong enough to rescue Cosima; Cosima and Delphine reunite.
Helena takes shelter behind enemy lines, and Sarah and Art struggle to protect her and end the siege.
Rachel gives Sarah an ultimatum, and her decision causes a clash with Kira; Felix brings an old ally into the mix.
Sarah and Kira spend time at home; secrets are unlocked about Kira's gifts; Cosima joins Delphine at the mansion.
Westmoreland demands a more aggressive action on Kira; Sarah fights to save her daughter; Rachel discovers a dark secret; Cosima has a clue about Westmoreland's identity.
