Inocencio Prieto y Calvo receives a letter telling him he is the heir to his uncle's fortune of two million pesos. Not being able to read he has no idea of who sent the letter or its content. So he goes to the drugstore because the pharmacist can read the letter to him. But while waiting to be helped he sees that a young girl can read. He figures he has to be able to discover the letter's content by himself and decides he will save the letter and go to school, and wait to read the letter on his own.
Cantinflas
as Inocencio Prieto y Calvo
Lilia Prado
as Blanca Morales
Sara García
as Doña Epifanita
Ángel Garasa
as Don Romulo González
Miguel Manzano
as Don Fermín
Carlos Agostí
as Licenciado Aníbal Guzmán
María Teresa Rivas
as Refugio González
Daniel Herrera
as El Poca Luz
Fernando Soto
as 'El Sapo'
Guillermo Orea
as Comisario
Óscar Ortiz de Pinedo
as Jesús López, notario público
Carlos Martínez Baena
as Profesor
