In the House of the Worm — George R.R. Martin

In a crumbling underground city on a dying planet, young Annelyn has lived a life of privilege. When he is humiliated at the hands of the crafty groun hunter they call the Meatbringer, he and his high-born friends plot revenge. But Annelyn's plan goes desperately awry, leading him deep into the city's ruins--and to the ugly truth about his forebears' reverence for the mythic White Worm.