On leave, and out of his head with boredom, NZDF Sergeant Taine McKenna joins biologist Jules Asher, on a Conservation Department deer culling expedition to New Zealand’s southernmost national park, where soaring peaks give way to valleys gouged from clay and rock, and icy rivers bleed into watery canyons too deep to fathom. Despite covering an area the size of the Serengeti, only eighteen people live in the isolated region, so it’s a surprise when the hunters stumble on the nation’s Tūrehu tribe, becoming some of only a handful to ever encounter the elusive ghost people. But a band of mercenaries saw them first, and, hell-bent on exploiting the tribes’ survivors, they’re prepared to kill anyone who gets in their way. As a soldier, McKenna is duty-bound to protect all New Zealanders, but after centuries of persecution will the Tūrehu allow him to help them? Besides, there is something else lurking in the sounds, and it has its own agenda. When the waters clear, will anyone be allowed to leave?