The Lure (2015)

While I was searching the most popular movie websites for horror movies to watch for the 31 Days of Horror challenge, whether I was looking for musicals or foreign language, there's a movie I stumbled upon multiple times, The Lure (Polish: Córki dancingu), a Polish fantasy, horror, romantic and musical film. In other words, a movie I could not pass. 

Set in Warsaw in the 1980s, the film follows two mermaid sisters, Silver (Marta Mazurek) and Golden (Michalina Olszańska), who are adopted by a family of musicians after assuring them they won't eat them and soon start performing at a nightclub as strippers and backup singers. While Silver falls in love with the bassist, Mietek (Jakub Gierszał), Golden cannot escape her bloodthirsty nature and kills people.