Sinopsis: 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.
Equipo creativo principal:
Reparto:
CantinflasInocencio Prieto y Calvo 
Lilia PradoBlanca Morales 
Sara GarcíaDoña Epifanita 
Ángel GarasaDon Romulo González 
Miguel ManzanoDon Fermín 
Carlos AgostíLicenciado Aníbal Guzmán 
María Teresa RivasRefugio González 
Daniel HerreraEl Poca Luz 
Fernando Soto'El Sapo' 
Guillermo OreaComisario 
Óscar Ortiz de PinedoJesús López, notario público 
Carlos Martínez BaenaProfesor Judy PonteOfelia González 
Luis Manuel PelayoMinisterio Público Lidia FrancoDoña Chona 
León BarrosoEmpleado del banco Armando ArriolaAsistente de Notario Palmira ArzubideMamá de Lupita 
Alberto CataláEl Güero Manuel AlvaradoDon Leoncio José PeñaDon Diego, boticario Margarita Villegas(uncredited) Alicia Moreno(uncredited) Salvador Terroba(uncredited) 
Armando AcostaCarpintero (uncredited) Jorge CasanovaEmpleado del banco (uncredited) 
José ChávezAsaltante (uncredited) Gerardo del CastilloAsaltante (uncredited) 
Pedro ElviroAlguacil (uncredited) 
Enrique García ÁlvarezSacerdote (uncredited) 
Roberto MeyerGutierritos (uncredited) José PardavéGorgonio (uncredited) 
Francisco ReigueraJuez (uncredited) Créditos técnicos adicionales:
Carlos VillatoroAssistant Director · Directing Esperanza GómezHairstylist · Costume & Make-Up Galdino R. SamperioSound Re-Recording Mixer · Sound Gunther GerszoProduction Design · Art Jacques GelmanProducer · Production 
Jaime SalvadorAdaptation · Writing James L. FieldsSound Javier MateosSound Recordist · Crew Jorge BustosEditor · Editing Pósters:
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