| Den låsta dörren |
Finland (Swedish title) / Sweden |
| Das Tor ins Verderben |
Austria |
| Dietro la porta chiusa |
Italy |
| Geheimnis hinter der Tür |
Germany |
| Hemmeligheden bag døren |
Denmark |
| Het geheim achter de deur |
Belgium (Flemish title) |
| Le secret au-delà de la porte |
Belgium (French title) |
| Le secret derrière la porte |
France |
| Lukitun oven salaisuus |
Finland |
| O Segredo da Porta Fechada |
Portugal |
| Salaisuus oven takana |
Finland (TV title) |
| Secret Beyond the Door |
USA (alternative spelling) |
| Secreto tras la puerta |
Spain |
| To mystiko tou 7ou domatiou |
Greece |
