en Cuevana 3. With his sidekick Rusty, Jeff Harper sails to paradisiacal tropical isle Ahmi-Oni to bargain on behalf of his cattle baron father for land owned by transplanted Irishman Dennis O'Brien. But Jeff falls in love with O'Brien's daughter, Eileen, and even his father can't break them up after he arrives and himself falls under the spell of island splendor.