The Lecumberri Penitentiary was one of the most notorious prisons in 20th-century Mexico, known for the notorious inmates who were held there and the appalling living conditions inside. This documentary records daily life in the prison shortly before its closure.

Betty is visited by a strange salesman the day she is going away on a trip. He stays in the house as a series of bizarre events occur with his arrival.

In Mexico City's infamous Lecumberri prison, three drug-addicted convicts celebrate getting drugs from one of their the mothers. They are found out and locked up in the "apando," the dreaded punishment cell. Protests over the treatment of those held in the cell lead to a bloody confrontation.