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An ailing millionaire and master jewel thief invites the best rival jewel thieves in the world to his island estate to compete for the ultimate prize in a suspenseful tale of action and intrigue starring John Saxon and Rex Harrison, and directed by Krishna Shah. Sir John Locksley is going to die. Before he does so, however, the wealthy former criminal mastermind wants to have a bit of fun with his prized possession - the Shalimar Ruby. Convinced that the gem should reside with a worthy successor upon his passing, Sir Locksley extends an invitation to the most skillful thieves on the planet to come to his island to compete for the priceless gem. Though the sole winner will walk away the proud owner of the world's most luminous jewel, the losers, in turn, will pay the ultimate price for their shortcomings in the competition.