Mateo Melgarejo is a notary public and scribe for the illiterate people of Santo Domingo, a neighborhood north of Mexico City's Zócalo. A squatter friend asks for his help in negotiating with the land census bureau to regularize a land title. After a great deal of frustration with the government bureaucracy, he writes a letter to the cabinet minister, earning an audience with him. The minister hires Melgarejo to reform the bureau, and the appointee proceeds to lecture the officials on their duties in a democratic society. At the end, he gives up the post, returning to Santo Domingo to help its poor residents.

Follows Diogenes as he goes about his day as a police officer. He's prone to do things the right way, surrounded by a pretty much corrupt & citizen distant police department, & always resolves his duties with a personal method.

After reading in the newspaper, Úrsulo runs to seek employment. It is the position of caretaker of a luxury apartment building habited by people more heterogeneous: the professional model, the spiritualist, hippies and all turn to him to solve their problems. But someone in the building, kidnapped an important person and Úrsulo becomes a private investigator.