End of the 19th century. León de Ubach, owner of an industrial Colony, returns from England with a splendid wife on his arm: Inés is beautiful, cultured, and thirty years younger than him. They are accompanied by Tessa, her sister, a hardened Suffragette who in London lived as a free woman. Life in the mansion goes by pleasantly until, after their first child is born, the wet nurse arrives, a wild and primitive girl from a remote area. The author's ironical and sometimes caustic writing takes us on a journey which begins with the impeccable recreation of a bourgeois nineteenth-century world: a world as artificial and amiable as a Viennese operetta. But the harmonious surface is misleading and the route is more treacherous than expected. The light waltz is corrupted and degraded until it becomes an insidious nightmare which borders on the genre of horror.