Barry N. Malzberg 
Sodom and Gomorrah Business [EPUB ebook] 

Death and Disorder 104.Institute courses told a grim story about the Network — that savage world beyond the closely guarded Institute gates. But they wanted to see for themselves. They had to know.Were they really females there? Would their training as mercenaries prepare them for the wild bands of grisly subhumans?They set out on a journey of discovery only to become the unwitting agents of forces that threatened to destroy the only world they’d ever known.