Carnaval Sujo.

Pedro and Inês, a couple, travel from Lisbon to watch Ovar's Carnaval. They get lost in the swamp of Ria, where they almost run over Teresa, a missing child. Teresa runs away, and Pedro and Inês search for her in the lagoon, white also protecting her from a strange and dangerous group of masked people who also look for the child called the Dominos.