Mystery Diners — Season 4

Patrick, owner of Buster's Beach House in Long Beach, Calif., calls Charles to investigate rumors that his Executive Chef is showing preferential treatment amongst the wait staff. Mystery Diners Tracy and Shelby go undercover and discover another problem behind the bar.

After losing several sushi models, Bruce, the owner of Lotus on Flower in Los Angeles, fears that one of his best customers is behaving inappropriately during the restaurant's "naked sushi" dining experience. Charles sends in Mystery Diner Christine to go undercover as a model to discover who is encouraging the inappropriate behavior.

After hearing rumors of unusual beer being served in his restaurant, Michael, owner of Newport Beach Brewing Company in Newport Beach, Calif., believes his onsite Brewmaster may be running a side business. Charles sends in Mystery Diners Amber and Grant and discovers more than one employee is brewing trouble.

When a lack of employee harmony threatens his restaurant, Vic, owner of Colombo's Italian Steakhouse in Eagle Rock, Calif., contacts Charles for help. Mystery Diners Grant and Shelby go undercover and discover the "Employee of the Month" title has created a cutthroat competition amongst the staff.

While recovering in Brazil from a paragliding accident that almost killed him, Kevin, owner of Gauchos Village in Glendale, Calif., has noticed a discrepancy in revenue and inventory at his restaurant. Charles sends in Mystery Diners Grant and Amber who discover the employees are taking advantage of Kevin's absence.

After receiving numerous complaints about his new Executive Chef, Pascal, owner of Bistro Bordeaux in Evanston, Ill., contacts Charles to investigate. Mystery Diners Nicole and Jay go undercover and discover the chef is being sabotaged from within the kitchen.

Gary and Tony, co-owners of Big & Little's Restaurant in Chicago, contact Charles after hearing rumors that employees are illegally selling alcohol to customers at their B.Y.O.B. restaurant. Mystery Diners Siera and Destiney go undercover and discover a mobile liquor store parked on the street.

After learning that several petite women have easily completed their grilled cheese eating challenge, Chris, the owner of Cheesie's Pub & Grub in Chicago, contacts Charles to investigate. Mystery Diners David and Destiney attempt the eating challenge for themselves and discover several employees are bending the rules for certain customers.

After receiving numerous complaints about his delivery service, Danny, the owner of Bella Luna Cafe in Chicago, contacts Charles for help. Mystery Diner Mark goes undercover and discovers both delivery drivers are taking advantage of the restaurant — and customers.

When Tommy, owner of Gigi Restaurant in Philadelphia, suspects that his mother/manager is discriminating against younger customers, he contacts Charles to investigate. Mystery Diners Miranda, Denise and Gregg go undercover and discover another problem employee.

After hearing complaints that their late night security guard is being too rough with customers, Dave and Mike Frank, co-owners of Del Rossi's Cheesesteak Co. in Philadelphia, contact the Mystery Diners for help. Charles sends in Joe and Kiara and discovers a bigger problem inside the kitchen.

After hearing complaints from his cross-dressing customers that the weekly quiz night is rigged, Bob, the owner of Venture Inn in Philadelphia, suspects his manager is responsible. Charles sends in Mystery Dinner, Danny, who goes undercover as a drag queen to infiltrate the trivia competition.

Marvin, the owner of Falls Taproom in Philadelphia, contacts Charles to help investigate an ongoing feud between his girlfriend/manager and best friend/customer. Mystery Diner Miranda goes undercover and discovers someone is taking advantage of Marvin.