In a vibrant, neon-lit night club in 1980s Warsaw, a family of musicians discovers two mysterious mermaid sisters, Silver and Gold, who have come ashore. Captivated by their enchanting voices and alluring presence, the family takes them in and incorporates them into their musical act. As they rise to fame in the bustling nightlife scene, the sisters' true nature and their complicated feelings about the human world begin to emerge. Silver develops romantic feelings for a bassist in the band, while Gold remains focused on their original purpose for venturing onto land.

As Silver becomes more entangled in her human love interest, the tension between her mermaid instincts and her desire to assimilate into human life intensifies. Meanwhile, Gold grows increasingly wary of the dangers and compromises inherent in this new world. The sisters' bond is tested as they navigate the complexities of love, identity, and survival in an environment that is both alluring and perilous. The story beautifully contrasts the enchanting allure of the mermaids with the harsh realities of human nature, leading to a poignant exploration of desire and otherworldly existence.