Eleven-year-old Eva is upset by the many rows between her parents and decides to run away. She wants to hide at her best friends Jackie and Thomas’ house, but circumstances bring her to her mysterious neighbour’s garden. She finds a secret letter there, which tells her the man is a king pin in a criminal organisation. And he is not exactly happy with Eva’s unannounced visit. To convince her of the importance of secrecy, he reveals that Eva’s dad is also involved in his illegal affairs. Eva hesitates: is her father who he claims to be? From that moment on, the enterprising girl does her utmost to exonerate her father from being involved. A period dawns in which Eva discovers that grownups also lead their own lives. She wants to ask questions, but at the same time she is afraid of the answers.
Unfortunately the movie The Secret Letter is not yet available on HBO Max.
| Directing | Simone van Dusseldorp | Director |
| Writing | Jan Terlouw | Novel |
| Production | Janusz Gosschalk | Casting |
| Art | Elsje de Bruijn | Production Design |
| Costume & Make-Up | Monica Petit | Costume Design |
| Costume & Make-Up | Françoise Mol | Key Hair Stylist |
| Costume & Make-Up | Françoise Mol | Makeup Department Head |
| Crew | Victor Horstink | Sound Recordist |
| Sound | Herman Pieëte | Sound Designer |
| Editing | Michiel Reichwein | Editor |
| Production | Brechtje Schaling | Line Producer |
| Camera | Lennert Hillege | Director of Photography |
| Production | Anna van der Staak | Co-Producer |
| Production | Leontine Petit | Producer |
| Production | Eva Eisenloeffel | Producer |
| Production | Joost de Vries | Producer |
| Writing | Marco van Geffen | Scenario Writer |
| Writing | Anna van der Heide | Scenario Writer |
| Production | Elske Falkena | Casting |
| Production | Job Castelijn | Casting |
| Costume & Make-Up | Maartje Wevers | Costume Design |
| Sound | Chrisnanne Wiegel | Music |
| Sound | Melcher Meirmans | Music |
| Sound | Merlijn Snitker | Music |
| Writing | Anna van der Heide | Creative Producer |
| Writing | Ernie Tee | Script Editor |
| Crew | Kees de Groot | Sound Recordist |
| Crew | Fleur Ankone | Property Master |
