English millionaire Sir Cyrus Bradley is being blackmailed by “The Tortoise” Crime Syndicate. He is to pay £ 100,000.00 Pounds to stay alive and not be murdered. After his refusal to pay the money, he is quickly killed. Cyrus‘ nephew, Don Micklem, plans to avenge the death of his uncle and sets out on a quest to expose “The Tortoise“…
Unfortunately the movie Mark of the Tortoise is not yet available on HBO Max.
| Directing | Alfred Vohrer | Director |
| Writing | Eberhard Keindorff | Screenplay |
| Writing | Johanna Sibelius | Screenplay |
| Sound | Werner Schlagge | Sound |
| Camera | Lilo Winterstein | Still Photographer |
| Production | Wolfgang Kühnlenz | Production Manager |
| Writing | Will Tremper | Writer |
| Production | Horst Wendlandt | Producer |
| Sound | Martin Böttcher | Original Music Composer |
| Camera | Bruno Mondi | Director of Photography |
| Art | Mathias Matthies | Art Direction |
| Art | Ellen Schmidt | Art Direction |
| Costume & Make-Up | Irms Pauli | Costume Design |
| Directing | Eva Ebner | Assistant Director |
| Writing | James Hadley Chase | Book |
| Editing | Hermann Haller | Editor |
