The original version of the plot involved munitions runners and government agents, focussing more on the super-explosive formula hidden in the idol. This was re-written during production but some elements remain, such as the otherwise nonsensical final chapter name "Operator No. 17" and Ula Vale's unexplained periodic use of disguises in the first few chapters (Ula Vale was originally written as a government agent using "Operator No. 17" as her codename and this plot element was dropped from the revised script, but only after some scenes from the earlier shooting script had been filmed, along with the main title cards).<ref name="erb0584" />
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