The old man at the Eirtola house warns the new maid Eriikka about the fate of Jenny, the summer girl. Jouko, a university student from Eirtola, arrives home for the summer and begins to court the pretty maid. At the cattle shed, Eriikka finds a box, the contents of which she examines together with Pastor Tuomo Ahomaa. The tragic fate of Jenny, the summer girl, is revealed.
Is Suviyön salaisuus on Netflix? Unfortunately the movie Suviyön salaisuus is not yet available on Netflix.
| Sound | Holger Wernbom | Sound |
| Sound | Väinö Haapalainen | Original Music Composer |
| Writing | Kaarina Viitainoja | Screenplay |
| Production | Theodor Luts | Producer |
| Production | Emil Viljanen | Producer |
| Art | Eero Leväluoma | Production Design |
| Writing | Aksella Luts | Screenplay |
| Writing | Erkki Uotila | Screenplay |
| Camera | Esko Töyri | Director of Photography |
| Camera | Auvo Mustonen | Director of Photography |
| Editing | Eino Kari | Editor |
| Directing | Eino Kari | Director |
| Writing | Kaarina Viitainoja | Novel |
