| Original title | Krok do tmy |
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| Danish title | Trin i mørket |
| Leikstjórn | Mac Fric |
| Screenplay | Edward Fiker |
| Based on | Efter en detektivroman af Edward Fiker |
| Director of Photography | Otto Heller |
| Appearance | Rolf Wanka, Adina Mandlová, Frantisek Smolik |
| Land | Tjekkoslovakiet |
| Domestic distribution | Absalon-Film |
| Technical info | 35 mm, Normal, Sort-hvid, Tone |
| Danish theatrical release | 10.06.1940 |
| Cinemas | Alexandra |
Companies |
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| Production company | Lucerna Film (Prag) |
| Domestic distribution | Absalon-Film |
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Instruktion |
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| Instruktion | Mac Fric |
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Manus |
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| Manus | Edward Fiker |
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Foto |
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| Foto | Otto Heller |
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Medvirkende |
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| Medvirkende | Rolf Wanka |
| Medvirkende | Adina Mandlová |
| Medvirkende | Frantisek Smolik |
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