| Original title | Testamentets Hemmelighed |
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| Danish title | Testamentets Hemmelighed |
| Other titles | Den Dødes Røst, De Dødes Røst |
| Leikstjórn | Holger-Madsen |
| Screenplay | Jules Portefaix |
| Director of Photography | Marius Clausen |
| Appearance | Lilly Jacobsson, Charles Wilken, Hugo Bruun, Philip Bech |
| Land | Danmark |
| Technical info | 1032 meter, 35 mm, Stum |
| Danish theatrical release | 28.04.1918 |
| Cinemas | Panoptikon |
| Kommentar | Nordisk neg. nr. 1507. |
Companies |
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| Production company | Nordisk Films Kompagni |
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Instruktion |
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| Instruktion | Holger-Madsen |
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Manus |
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| Manus | Jules Portefaix |
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Foto |
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| Foto | Marius Clausen |
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Medvirkende |
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| Nancy Keith | Lilly Jacobsson |
| Baron Mac Treverton | Charles Wilken |
| William Treverton, baronens søn | Hugo Bruun |
| Richard Grant, Nancys formynder | Philip Bech |
| Medvirkende | Peter Jørgensen |
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