La Sirena

Mia, a woman who lives in a small fishing village is having an affair with Hector, a married fisherman. On the day Hector threatens to end the affair, Mia discovers a mysterious woman, Mara, washed up on shore, naked and with a hook lodged into her ribcage. After Mia brings her home and heals her, Mara tells her that a fisherman tried to stab her in the heart. With suspicions that Hector might have been involved, Mia is forced to confront Hector and, eventually, surrenders to her inner monster to avenge her broken heart.