The Only Girl in the Game — John D. MacDonald

Her employers are the high priests of Las Vegas and she is their handmaiden. Her job is to lead the lambs to the sacrifice, to keep them happy at the tables, where her partners slaughter the suckers. She longs to be free of the entertainers rubbing elbows with thugs at the craps tables, the divorcées hocking their jewels next to all-night marriage chapels, and the little white balls bouncing along the roulette wheels twenty-four hours a day.

But no matter how hard she tries to escape her past, she's fated to be caught for ever backstage in the sick glitter of the infamous strip with nothing but sand and neon and money, money, everywhere.