Based on Ladislas Fodor's "Stranger on the Stairs". A loved triangle composed by a cynical entrepreneur, a loan manager, and a seductive secretary will lead to a criminal plot in Cuba.
| Actor | Role |
|---|---|
 Arturo de CórdovaAlberto Nuñez | Alberto Nuñez |
 Silvia PinalLaura | Laura |
 José María Linares RivasFrancisco Gutiérrez (as Linares Rivas) | Francisco Gutiérrez (as Linares Rivas) |
 Andrés SolerAnciano | Anciano |
| BBertica SerranoNot listed | Not listed |
| SSonja MarreroNot listed | Not listed |
| LLuciano de PazosNot listed | Not listed |
| LLazara RiveroNot listed | Not listed |
| MManuel PomarNot listed | Not listed |
| IIsabelita EliasNot listed | Not listed |
| CCésar PomarNot listed | Not listed |