Two journalists, Carlos and Lola, investigate the murder of a young woman whose body appeared with her heart torn out, in what seems to be a human sacrifice. The investigation leads the reporters to a museum, whose director is the famous Doctor Gallardo.

Cantinflas
as Cantinflas

Manuel Medel
as Medel

Carlos Orellana
as Dr. Gallardo

Elena D'Orgaz
as Lola Ponce

Tomás Perrín
as Carlos Manzano

Max Langler
as Matlatzín

Matilde Corell
as Tía Mati

Elia D'Erzell
as Alicia

Alfonso Parra
as El comisario

Manuel Arvide
as Jefe de redacción (uncredited)