From Goodreads:

“A fortune in Palmer River gold disappeared on the Great Barrier Reef during a cyclone over a century ago.
Vietnam veteran, Scott, operating big-fish charters out of Port Douglas in Far North Queensland with a friend and fellow vet Ben, has researched the history of the treasure for years.
After finding a clue to its whereabouts, their search leads to the wreck of an old warplane hiding a gruesome secret about a powerful politician.
The innocent discovery almost costs them their lives.
Meanwhile, the local drug baron is insisting on a favour in return for financing their boat.
Fashion executive Michelle comes to their rescue, but is there more to her offer than appears on the surface?
As if their local enemies were not enough trouble, they stumble onto an ancient secret that the Chinese government wants to remain hidden forever.