The play is set in Mexico City in the 1960s, with the focus on two poor young people who accidentally derail a train, and then have to face the consequences of punishment and everyone's varying perceptions of their deed. The play is broken up into twenty-one short scenes, opening with a spotlight on the Medium. She has a long poetic monologue in which she sees her heart as a sea anemone and claims she stores part of everything she's seen in herself. She says she receives information about events that will happen.

The next scene starts in the dark with the sound of a train crash, and a Newsboy hawks his papers with news about a tram derailment. The play then shifts to a city scene with two young people, Tona and Polo, struggling to fish coins out of a telephone booth so they can buy...