Las Vegas by day is a marvel of architectural achievement. The four-mile stretch of Las Vegas Boulevard known as "the Strip" is lined with theme-based hotels, casinos, and restaurants that re-create the world in the Nevada desert. Rome, Paris (complete with faux Eiffel Tower), New York City, and ancient Egypt are all within walking distance.

Las Vegas at night is a different story. The impressive buildings are obscured by a barrage of neon light and stories-tall television screens that preview nearly nude showgirls—and boys. Men on the sidewalks wear sandwich boards advertising "Girls Direct to Your Room" while others pass out trading cards for call girls. From the innocuous to the sinister, you can find any form of entertainment or vice on this short stretch of desert highway.

Enter Craig Gross. Craig began ministry as a youth pastor. When he realized that many of his kids were struggling with Internet pornography addictions, he founded an online resource for recovery and accountability ...