Rene and Camilo are a married couple who on the morning of their 20th anniversary dig out a time capsule full of memories, old photographs, letters and music written by them. With this event old feelings are unveiled, which leads Camilo to start acting strange, and to a surprise, to be discovered by Rene in what appears to be an act of self-harm. Suspicions are born on the part of Rene, who now rethinks all of Camilo's memories and actions, creating in her a huge doubt about the intentions of her husband. Pasado Tardío portrays what could be the beginning of the end of Rene and Camilo's marriage.