A mexican engineer becomes a private detective in Mexico City
| Actor | Role |
|---|---|
 Pedro Armendáriz Jr.Héctor Belascoarán Shayne | Héctor Belascoarán Shayne |
 JulissaElisa | Elisa |
 Ernesto Gómez CruzGilberto Gómez Letras | Gilberto Gómez Letras |
 Guillermo MurrayMarques | Marques |
 Hilda AguirrePonytail Girl | Ponytail Girl |
 Juan PeláezCarlos Belascoaran | Carlos Belascoaran |
 Manuel 'Flaco' IbáñezJavier Villarreal, the cock | Javier Villarreal, the cock |
 Susana KaminiMónica | Mónica |