Capt. W.E. Johns 
Worrals Down Under [EPUB ebook] 

When Worrals and her friend Frecks go to Australia to start up their own airline, they expect a quiet and steady life; instead they meet with high adventure. They join in a search for a rich deposit of opal on their friend Janet’s farm in the “outback”; and there the excitement starts. They find themselves engaged in a deadly struggle against a gang of desperate men who stop at nothing in their attempt to get the opal for themselves. Blood-chilling screams in the desert at night . . . attempted murder . . . an ambush . . . dishonour among the thieves.