We‘re not alone, and the “others” live below our feet. Scientists, soldiers, and then ordinary people encounter the Hadal, a hominid species from continents deep beneath the surface. The brutal, enigmatic Hadal culture is torturously interesting, as are the ways humans fight it, study it, exploit it, even adopt it. The main adventure is epic in scope and perfectly brief subplots sting with unexpected consequences. Looking forward to the sequel!