Fearing that his staff is pranking customers with the restaurant's mouth burning "Devil"s XXX" hot sauce, Ken, owner of Looney's BBQ in San Leandro, Calif., asks Charles to investigate. Mystery Diners Brianna and William go undercover to find out who is the real culprit.
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.
When Don, owner of Rocco's Cafe in San Francisco, hears rumors that his new manager is running unauthorized promotions, he contacts Charles to investigate. Mystery Diners Brianna and Nate go undercover to show Don how his restaurant is really being run.
Philippe, owner of Chapeau! in San Francisco, contacts Charles to investigate complaints that his wait staff is rude with customers. Mystery Diners Kiel and Brianna go undercover and discover an even bigger problem.
When Cindy, co-owner of Speisekammer in Alameda, Calif., fears the German "Dirndl Girls" hired by her ex-husband are causing more harm than good, she contacts Charles to settle the dispute. Mystery Diners Hollie and Nate go undercover and discover what the girls are really up to.
After noticing that several bottles of expensive wine have gone missing, Michael, owner of Bistro Baffi, in Burien, Wash., contacts Charles for help. Mystery Diners Allison, Julie and Benny go undercover and discover someone in the staff is taking much more than a paycheck.
After finding broken dishes is his trash on numerous occasions, Nader, who owns My Greek and Italian Restaurant in Tacoma, contacts Charles to investigate. Mystery Diners Brianna and Nadine go undercover and discover someone on the staff is getting carried away with Greek traditions.
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.
Blaine, the owner of Zippy's Giant Burgers in Seattle, contacts Charles to investigate rumors that his new mascot is misbehaving. Mystery Diners Nadine and John go undercover to discover exactly who is behind the mascot costume.
When Demetri, owner of Taverna Mazi in Seattle, hears rumors that customers are taking "haunted tours" of his restaurant, he contacts Charles to investigate. Mystery Diners Hollie and John go undercover to show Demetri if his staff is getting carried away with the ghost stories.
After noticing an unusual increase in coupons, Aaron, owner of The Hangout in California, calls Charles to investigate. Mystery Diners Shelby and Kiel go undercover and discover the wait staff is taking advantage of their situation.
David and Petra, owners of Redballs Rock & Roll Pizza in Moorpark, Calif., contact Charles to investigate discrepancies in their pizza supplies. Mystery Diners Amber and Grant go undercover and find out what's really going on backstage at Redballs Rock & Roll Pizza.
Peter, owner of Encore Dinner Theatre, fears a relationship between one of his waiters and one of his actresses is affecting customer service. Charles sends in Mystery Diners Rob and Amanda to find out who's really responsible for all the drama.