In a quiet coastal town, eleven-year-old Olivia faces constant misogynistic harassment from the boys and men around her. She finds solace in an old picture book; a tale of sirens who rise from the crashing waves to fight back against their captors. As strange signs draw her toward the sea, she follows a spectral woman into the depths. What begins as a retreat into fantasy becomes a radical act of reclamation, as Olivia emerges with a voice sharpened by rage and ancient power.