Protagonist and gambler recruited by Roberta to smuggle radios to revolutionaries. Falls in love with Roberta, shelters her after her arrest, and risks everything to free her husband using a diamond hidden in his arm. Leaves Cuba after the revolution succeeds but returns annually to the Keys hoping to see her again.
Marion functions as Jack's intelligence contact and reluctant source of essential information.
Jack asks Marion to confirm whether the imprisoned revolutionary leader is alive, then intimidates Marion into helping free him.
Their professional relationship changes when Joe recognizes that Jack has prioritized rescuing the woman he loves.
Joe Volpi manages the casino where Jack plays, and he forgives Jack after Jack loses an important high-stakes game.
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