Ten years after her daughter was the victim of a hate crime, brutally beaten in the streets of Santiago for being a lesbian, Nancy is asked to participate in an unsolved mysteries TV show that will recreate the incident. Nancy, a hairdresser who has worked very hard to move on with her life, will have to decide if finding justice for her deceased daughter is worth exposing herself and her family on television.

Through illustrations and sounds, Una vez la noche experiments with the obsessive narration of four diverse characters –all of which are lost in the settings of their memory– to exhibit crucial events that marked their lives forever. Through a particular mise-en-scène, the film provides apparently ordinary people with a brilliant singularity, introducing us to a new perception of reality.

After long decades of exile, a leftist former activist returns to Chile to settle accounts with his conscience, related to the death of a colleague and political hero . The task of Atalibar is to reveal his secret. But his view clashes with the current country, godless, far from the old ideologies and where all his old colleagues have changed.

A man is obsessed with John Travolta's disco dancing character from "Saturday Night Fever".

In Chile, 1973, during the last days of Salvador Allende's presidency, an employee at a Morgue's recording office falls for a burlesque dancer who mysteriously disappears.

18-year-old Rodrigo is arrested by the police in a televised raid on the club where he works as a drag queen.

A man takes his insecure, overweight paramour to a seaside resort to consummate their relationship, but there he stumbles onto an artistic discovery that will change his life.

In the winter of 1978, under Chile’s dictatorship in Santiago, disabled architectural model maker Raúl Peralta leads a quiet life caring for his ailing mother. His routine is shattered by the arrival of new neighbors whose sinister activities seem to hide dark secrets.