- HD 1080
- Runtime: 90m.
- Status: Released
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- Languages: de
- Country: Germany
- Director: Alfred Vohrer
- Stars: Hildegard Knef, Götz George, Richard Münch, Heinz Reincke, Carl Lange
- keywords: ransom, revenge, murder, inheritance
- Production_studio: Rialto Film
- The Mark of the Tortoise is featured in the top rankings of 1964
- #26 in Top Crime Movies of 1964
- #33 in Top Thriller Movies of 1964
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“…