Ensayo de un crimen
Archibaldo de la Cruz (Alonso) is a wealthy Mexican man. As a privileged child during the Mexican Revolution, he witnessed the death of his governess, who died as she told him a fable about a music box that his mother had just given him. Because of the contents of the story and the coincidental timing of the governess's death, a young Archibaldo concludes that he had killed the woman using the music box. It is from there that his desire to kill begins.
As an adult, Archibaldo relates this story to a nun, and threatens to kill her with a straight razor. The terrified woman runs from Archibaldo, eventually running into an empty elevator shaft to her death. Archibaldo is called in by a judge investigating the incident. He confesses that he is responsible for her death, and for many others.
Patricia Terrazas (Macedo), is rather loud and constantly at conflict with her lover. After witnessing a fight between her and her lover, Archibaldo follows her and offers to drive her home, which she accepts. On arriving, he fantasizes of killing her with his straight razor, but is interrupted when her lover arrives home. The next morning a police officer arrives at Archibaldo's home, with news that Patricia had committed suicide.
Next, Archibaldo turns his attention to Carlota Cervantes (Welter), a woman who outwardly appears very religious, and is purported to be a virgin. However, she is having an affair with a married man. Archibaldo approaches her saying that he is very conflicted between good and evil. He thinks that Carlota can fix his problems, and proposes to marry her.
In the meantime, Archibaldo pursues another woman, Lavinia (Miroslava), whom he met in an antique shop, and later a bar. Lavinia works as a model for mannequins, and also shows American tourists around town. Archibaldo invites Lavinia to his home under false pretenses. He tells her that when they met, she reminded him of Joan of Arc being consumed by flames. He plots to strangle her and burn her in a kiln, but unexpectedly, the doorbell rings. It is Lavinia's tourist friends, the gringuitos. Lavinia has a disappointed Archibaldo take them on a tour of his home. When they leave, Lavinia says that she must go as well, and that she cannot see Archibaldo again because she is getting married.
Just as this is happening, Carlota comes in with her mother to accept Archibaldo's proposal. But Archibaldo soon learns of her adulterous relationship, and is displeased. He fantasizes about making her kneel and pray on her wedding night, and shooting her while she is praying. The wedding goes through, however, her jilted ex-lover ends up shooting her instead.
After having heard all of this, the judge says that Archibaldo has committed no crimes, and that merely thinking of killing people is not a crime. Archibaldo, despite his intense feelings of guilt, is deemed innocent. As if to be processing this unexpected reaction, Archibaldo takes a walk in the park. He then throws his music box into a lake, and moves on. He runs into Lavinia, whose marriage did not work out. The two walk together and the film ends.
psychedelic, comedy