THE COLD RESIDUE OF A SIX-HUNDRED-YEAR-OLD SECRETCommercial maritime salvager Nicole Lang is used to the dangerous currents of the Great Barrier Reef. But pulling a sub-fossilized timber fragment from a deeply silted trench changes everything. It's not just a wreckage. It's definitive proof that Admiral Zheng He's 15^th-century fleet explored the east coast - and left behind a map that could rewrite modern international borders.Suddenly, the hunt is not just about salvage - it's a race to stay alive.From a ruthless billionaire in Beijing, to his chilling, cold and calculated enforcer tracking the salvage teams every move, a sovereign-backed shadow network is closing in. With a wounded partner to protect, Nicky and her gear-head mechanic Penny must dive thirty metres down into a lethal underwater kill zone.The deep water is hiding the ultimate prize - and the ultimate trap.