The story of this film is based on actual facts, the murder of actress Maria Alves, and the investigation that ensued, covered by Reinaldo Ferreira himself. Ferreira also wrote a novel based on the same facts.
| Actor | Role |
|---|---|
 Alves da CostaLieutenant Hair | Lieutenant Hair |
| MMaria Emília Castelo BrancoRaquel de Monteverde | Raquel de Monteverde |
| AAlexandre AmoresArsénio de Castro | Arsénio de Castro |
| FFernanda Alves da CostaEva | Eva |
| AAntónia de SousaIsabel Rodrigues | Isabel Rodrigues |
| HHenrique de AlbuquerqueFélix do Amaral | Félix do Amaral |
| AAlberto MirandaHorácio de Azevedo | Horácio de Azevedo |
| MManuel SilvaDon Alfonso | Don Alfonso |
| RRoberto FernandesGuilherme Dinis | Guilherme Dinis |
| AAdriano GuimarãesDon Alvaro | Don Alvaro |