Twilight in Xanadu — William G. Tolliver

Sam Zavich, ex-Marine and construction boss, is only trying to help an old friend when he becomes entangled with Xanadu, a high-end desert resort which purports to offer pleasures beyond imagination. In fact, they serve up sex, blackmail, and death. Barely escaping with his life, Sam recruits his gang of former military buddies to stage a commando raid and erase Xanadu from the earth. However, a top-secret government group has also targeted Xanadu, and they deal not in pleasure but only in death. High-ranking government figures have been involved with the resort, and the corruption may go all the way to the top. Sam and his friends, pitted against a man known only as Stone, will gamble their lives against the odds of prevailing in another forgotten war.