In Warsaw, a pair of mermaid sisters are adopted into a cabaret. While one seeks love with humans the other hungers to dine on the human population of the city.
One dark night, at water's edge, a family of musicians encounter aquatic sirens Silver and Golden. After assuring the family that they won't eat them up, the winsome sirens are recruited to join the Figs and Dates band at a neon-lit Warsaw dance club. When Silver becomes romantically entangled with beautiful blonde bassist Mietek, the more cunning Golden, who cannot escape her bloodthirsty nature, worries that her sister's relationship will doom their shared dream of swimming to a new life in America.—Anonymous
Some time in the 1980s, two mermaids, Golden and Silver, encounter a rock band, Figs n' Dates, relaxing and playing music on a beach in Poland. They accompany the band back to the nightclub where they regularly perform and begin playing gigs there, performing as strippers and backup singers. The mermaids soon become their own act, The Lure, with the band backing them. Golden murders a bar patron after a show one night and continues to thirst for blood; Silver falls in love with the bassist Mietek, but Mietek only sees her as a fish and not a woman.
Golden meets Triton, a fellow sea creature and singer of a metal band, who informs her that if her sister falls in love and her love marries someone else, she will turn into sea foam; if she is to have her tail removed, she will lose her voice. When Golden's murder victim is discovered, one of the bandmates punches Silver and Golden, and it appears that they die. The bandmates roll their bodies in carpets and throw them into the river. But they return to the club, alive, and the band apologizes. Silver has her tail surgically replaced with a pair of legs to make Mietek love her back, but this makes her lose her singing voice. She tries to have sex with her new lower-half, but Mietek is disgusted when she gets blood on him from her surgery scars.
Mietek later meets a woman in a recording studio, whom he marries. The sisters attend the reception; Golden and Triton warn Silver that she must eat Mietek before daybreak or she will become sea foam. Silver dances with Mietek, but cannot bring herself to eat him, and turns into sea foam in his arms. Distraught, Golden tears Mietek's throat out and returns to the ocean in full view of the entire wedding party.
