Set in Peru during the 1950s, Aunt Julia and the Scriptwriter is the story of an 18 year old student who falls for a 32 year old divorcee. Mario, an aspiring writer, works at a radio station that broadcasts, live each day, up to a half-dozen short-run soap operas.

At the same time that the author meets his Aunt Julia, the radio station, which had been buying scripts by weight from Cuba, hires a Bolivian scriptwriter named Pedro Camacho to write the serials. The novel chronicles the scriptwriter's rise and fall in tandem with the protagonist's affair.