Mark of the Tortoise

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"...