MSNBC Undercover

They look like average shoppers but they're not. They're boosters, and if you look closely in any retail store, you're bound to find them. These work-a-day professional shoplifters can steal thousands of dollars within minutes, amounting to billions of loses every year. But now, armed with their own investigators, big business is fighting back.

Behind the doors of Houston's glittering spas, massage parlors and bustling urban bars called cantinas, teenage girls and young women sell themselves for cold cash. They all came to Texas with great hope, but their dreams of supporting loved ones back home became a nightmare of daily rape and beatings. Fueled by a booming sex industry…buying girls in Texas has never been easier.

It all started with a simple email. Meet Shireen, a woman who knew all about email cons, yet still fell for a scam and lost her life savings.