Melusina is a mythical figure from European folklore, a freshwater mermaid characteristic of the myths and legends of Luxembourg. The "Melusinas" of the title are the five women, born in Luxembourg to immigrant families, who star in the debut feature film by director Melanie Pereira, who was also born and raised in Luxembourg, the daughter of Portuguese emigrants. What is it like to be a Luxembourger, when this is a country of immigrants? What is it like to be an immigrant in your own country? As Melusinas à Margem do Rio seeks to answer these questions by eulogising the chimerical nature of diasporic identities: an attempt to reconcile the fragments that make up their individuality.