Beyond All Boundaries Trilogy Book 2 by Lyn Willmot

As the story continues, friends of the missing archaeologist and his son discover the mythical kingdom hidden deep in the Kimberley ranges. After many skirmishes, they are finally convinced by the oracle to help ChaldeeÑthe ruler of the kingdomÑfind a professor who is developing a powerful healing substance aimed at helping mankind. Governmental forces want to suppress this scientific discovery, so the clash of ideologies as Chaldee and her earthling friends find, then transport the professor to safety is gripping. They film their entire adventure, but as it is being broadcast the authorities try to shut down the television station. These high-level officials will not heed the oracleÕs warnings of a coming planetary disaster, so Chaldee and her friends withdraw, returning to her sovereign domain in the wilds of northern Australia.