When Joe, the owner of Harvey's Steakhouse in Huntington Beach, Calif., notices a decline in his restaurant's older customers, he contacts Charles Stiles to investigate. Mystery Diners Destiney and Hal go undercover and discover the staff is hosting unauthorized events to drive in younger patrons.
After noticing lackluster dinner sales and a dip in bottle service, Freddy and Abdi of Supperclub in Los Angeles contact Charles Stiles for help. When he sends in Mystery Diners Eliot and Felicia, they discover the staff is using a street vendor to line their pockets.
Michael, the owner of Rock Island Cafe in Honolulu, is concerned about a drop in his restaurant's memorabilia sales. Charles Stiles sends in Mystery Diners Jordan and John and discovers the staff is using the restaurant for personal business.
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 inheriting some of their staff from the previous owner, James and Briana, the new owners of Sam's Tavern in Seattle, believe there is a divide between the old guard and their new employees. Charles sends in Mystery Diners Nadine and Jason to discover who's responsible for the rift.
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.
Uche, owner of The Anchor Bar and Tattoo in Atlanta, contacts Charles Stiles after noticing a drop in food and tattoo sales. Mystery Diners Meagen and Justin go undercover to see if the two problems are related.
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 Paul, owner of Nacho Daddy in Las Vegas, notices a discrepancy in the expensive scorpions used in his restaurant's "scorpion shot," he contacts Charles Stiles to investigate. Mystery Diners Andy and Peter go undercover and discover an employee with a gambling addiction.
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.
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.
Concerned about vandalism at his new restaurant location, which is currently under construction, Manny of the Spanish Potato Grill in Brick, N.J. reaches out to Mystery Diners for help. Charles Stiles sends in Megan and Daniel, who learn the restaurant is being sabotaged from the inside.
Carl, owner of Bakehouse Restaurant and Bar in Austin, Texas, fears a dispute between his son and favorite waitress is threatening the harmony of his restaurant. Charles sends in Mystery Diners Holly and Samantha to decide which employee has to go.
When Chef Chai, owner of his namesake restaurant in Honolulu, notices multiple ticket voids, he contacts Charles Stiles for help. Mystery Diners Jordan and David go undercover to see if his staff is making honest mistakes or committing foul play.
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.
Brother-sister owners Richard and Marilyn of Langosta Lounge in Asbury Park, N.J. contact Charles Stiles after noticing a discrepancy in their lobster supply. Mystery Diners Megan and Natale go undercover to discover where the lobsters are going.
After hearing rumors that customers are being served food off-menu, Esdras and Javi, owners of Mexicali Tacos in Los Angeles, call Charles to investigate. Mystery Diners Brenda and Grant go undercover to find out what the head chef is really cooking.
After hearing rumors that customers are being served meat at his vegan restaurant, Mitch, owner of Source in San Francisco, contacts Charles for help. Mystery Diners Amber and Brianna go undercover and discover what's really being cooked up in the kitchen.
Byron, owner of B-Man's Teriyaki and Burgers in Pasadena, Calif., becomes suspicious when he notices a drop in customers. Charles Stiles sends in Mystery Diners Kiel and Eliot, who uncover a problem with the drive-thru staff.
Damian, owner of Doffo Winery in Temecula, Calif., contacts Charles Stiles after noticing missing wine barrels. Mystery Diners Jamie and Kendall go undercover to see which employees are responsible.
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.
Marko and Brett own competing food trucks in San Diego, but put aside their differences to investigate revenue loss in both of their vehicles. Charles Stiles sends in Mystery Diners Seth and Corinne, who discover that their employees are turning a friendly competition into an all out war.
When Rod and Linda, owners of a la carts Food Pavilion in Portland, Ore., hear complaints from their tenants about the new onsite manager, they contact Charles Stiles to investigate. Mystery Diners Amber and Joshua go undercover to see if the grievances are valid.