Enrique kills a man for stealing him a check he has received due to an accident. However, things get complicated because it had not yet been cashed. This will force him to try to forge the signature and eliminate any suspect, including his girlfriend Clara, who works in a law office and who talked him about the check. Police tracks the case, but by chance Pedrito, the police inspector's son, is also investigating on his own.
| Directing | Antonio Santillán | Director |
| Art | Antonio Liza | Set Decoration |
| Production | Gonzalo Elvira | Producer |
| Sound | José Casas Augé | Music |
| Costume & Make-Up | Adrián Jaramillo | Makeup Artist |
| Writing | José Antonio de la Loma Jr. | Screenplay |
| Editing | Juan Luis Oliver | Editor |
| Writing | Ignacio F. Iquino | Screenplay |
| Writing | Cornell Woolrich | Author |
| Production | Ignacio F. Iquino | Producer |
| Directing | José María Nunes | Assistant Director |
| Sound | Miguel Sitges | Sound Engineer |
| Production | Valentín Sallent | Production Manager |
| Writing | Joaquina Algars | Screenplay |
| Camera | Ricardo Albiñana | Director of Photography |
