The plot follows an attractive blonde outcast who devises an elaborate plan to avenge the humiliation she suffered at the hands of a policeman who killed her boyfriend and smashed her teeth with the butt of a gun.

Estefania Sánchez, known as Fanny Pelopaja for her bleach blond hair, is a cold-blooded woman who recently has been released from jail after serving a three-year sentence.

A phone call from one of her old cronies informs her that Andrés is working in Barcelona as a security guard for an armored car company.

A married man with a wife he despised and two teenage children who do not pay attention to him, Andrés quickly became obsessed with Fanny, and they met regularly in the same hotel room for casual sex.

Back in Barcelona, Fanny is reunited with her old friends, Julián and his girlfriend, La Nena, Manuel's sister.

Spanish producer Carlos Durán approached director Vicente Aranda showing him the novel Prótesis, written by Andreu Matín, with the idea of making a film out of it.

Aranda had been uncomfortable tackling the subject of homosexuality in his previous film Cambio de Sexo therefore he decided to transform the male protagonist into a female and make the story of love and revenge between a heterosexual couple.

[5] Aranda had a casting session in Paris and ultimately choose Fanny Cottençon and Bruno Cremer for the two main roles.

The film had a budget of 76 million pesetas with 70% Spanish capital and 30% of the cost covered by the French production company.

[6] Prótesis, the original title of the book, which makes reference to dentures that the main character has to wear, was avoided having little commercial appeal.