Cosima is forced into an alliance when an old enemy returns to the island, accelerating P. T. Westmorland’s sinister agenda. Meanwhile, on the mainland, Krystal stumbles onto a vital clue…

While Sarah and Kira spend some well-needed bonding time at home, secrets are unlocked about Kira’s special gifts that are surprisingly linked to the island’s creature. Meanwhile, Cosima joins Delphine…