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In page Thunderball (novel):

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Those elements which Fleming used which can be put down to McClory and Whittingham (either separately or together) include the airborne theft of a nuclear bomb,[4] "Jo" Petachi and his sister Sophie, and Jo's death at the hands of Sophie's boss. The remainder of the screenplay was a two-year collaboration among Fleming, Whittingham, McClory, Bryce and Cuneo.[5]