Ana is an aspiring opera singer, and Federico a musician and frustrated painter. A few years after these young artists get married, the sudden appearance of a young woman called Ursula changes their lives forever. Ana is at her singing teacher’s house when she hears the extraordinary voice of Ursula, who has a mysterious personality. Ana’s fascination drives her to get disturbingly close to Ursula, and she ends up revealing the intimate and private universe she has with Federico. A love triangle that mixes seduction, jealousy and admiration begins.