A former singer lives alone with her fortune - and with her nephew, Fernando, a low character to whom she refuses to lend more money. Elisa leaves prison and starts a new life as a personal attendant to the aging singer, using her knowledge as a former nurse - a profession she can not return to. Fernando meets Elisa, and together they plan to poison the lonely woman, and use her money abroad. They plan their alibis well. But those who kill by the sword will perish by the sword.
| Actor | Role |
|---|---|
 Olga ZubarryElisa | Elisa |
 Alberto de MendozaFernando | Fernando |
 Luis PrendesInspector | Inspector |
 Katia LoritzLuisa | Luisa |
 José NietoComisario Ávila | Comisario Ávila |
 Luis PeñaChófer | Chófer |
 Jesús TordesillasFarmacéutico | Farmacéutico |
 José Marco DavóDoctor | Doctor |
| AAna María NoéDoña Ana | Doña Ana |
 Jorge VicoCarlos Alonso | Carlos Alonso |
 Félix DafauceForense | Forense |
 Tota AlbaAmiga de Sabina #1 | Amiga de Sabina #1 |
 Pilar Gómez FerrerAmiga de Sabina #2 | Amiga de Sabina #2 |
 Eugenia ZúffoliDoña Sabina | Doña Sabina |
 José BódaloDoctor Cáceres | Doctor Cáceres |
 Manuel DicentaDoctor Alonso | Doctor Alonso |