"Mystery Diners" is a television show that focuses on the restaurant industry. In each episode, a restaurant owner hires undercover diners to evaluate their staff's performance and customer service. The diners report back on their experiences, revealing any issues that may be affecting the restaurant's reputation. The show aims to help restaurant owners identify problems such as poor service, food quality, or employee behavior. By using hidden cameras and secret diners, Mystery Diners provides valuable insights that can lead to improvements and ultimately enhance the dining experience for customers.