Sarah fights for her life on the Island and tries to stay strong enough to rescue Cosima; Cosima and Delphine reunite.
Rachel gives Sarah an ultimatum, and her decision causes a clash with Kira; Felix brings an old ally into the mix.
Alison seeks to return to her community center, but Bailey Downs has moved on; the ghost of friendships past haunt.
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.
Cosima is forced into an alliance that accelerates PT Westmorland's agenda; Krystal stumbles onto a vital clue.