When Will, co-owner of Whiskey Dick's in Las Vegas, becomes concerned over a steady decline in female patrons, Charles and the Mystery Diners come in to investigate. Mystery Diner Shellene goes undercover as a waitress and learns that the manager is serving more than just drinks from the bar.
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.
Danny and Jonathan, owners of Old School Bar and Grill in Austin, Texas, are concerned about a loss of revenue on their "Poetry Nights." Charles sends in Mystery Diners Justin and Samantha to find out why the register is being affected.
After noticing missing food and merchandise, Shauna and Joe, owners of Epic Rollertainment in Murrieta, Calif., contact Charles Stiles for help. Mystery Diners Kendall and Eliot discover an ever bigger problem when the roller rink closes at night.
Fearing that his new baker is taking artistic license with customer cake orders, Lenny, owner of Lenny's Deli in Los Angeles, asks Charles Stiles to investigate. Mystery Diners Kiel and Kendall go undercover and discover an even bigger problem inside the deli.
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.
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 already successfully battling one fast food chain over the rights to his signature sandwich, Damien, the owner of Devine Pastabilities in San Diego, now fears someone from within his organization is trying to steal his culinary creation. Charles Stiles sends in Mystery Diners Amanda and Andy to investigate.
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.
Mystery Diners counts down the top ten biggest twists that surprised Charles Stiles and the various restaurant owners who called for help.
Keith, the owner of Deanie's Seafood in New Orleans, is concerned that his manager is more focused on his amateur comedy career than managing the restaurant. Charles sends in Mystery Diners Andrew and Deanna who discover that another employee may be taking advantage of the situation.
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.
When Lee, owner of Old Vinings Inn in Atlanta, hears rumors of unauthorized "Civil War Tours" taking place inside his historical restaurant, he contacts Charles Stiles to investigate. Mystery Diners Kendall and Eliot go undercover to see how authentic the tours really are.
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.
Sonny and Sage, owners of Hot Red Bus near Los Angeles, contact Charles Stiles after hearing rumors that their restaurant is open on the one day it's supposed to be closed. Mystery Diner Kendall goes undercover to see what's going on when the doors are locked.
Mystery Diners counts down the series' greatest moments catching employee theft, involving stolen food, alcohol, supplies and money.
Mystery Diners counts down the craziest schemes caught on video, from operating unauthorized businesses, raising money for bogus charities, and even creating fake employees to collect extra paychecks.
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.
After hearing multiple complaints about nonmembers attending members-only dinner events, Madeleine, general manager of Hawaii Yacht Club in Honolulu, calls Charles Stiles for help. Mystery Diners Kylie and Jamie go undercover to discover which employees are sneaking in their friends.
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.
Fearing that his regular customers have become too entitled, Larry, owner of 730 South in Denver, asks Charles Stiles to investigate. Mystery Diners Ariel and Conner go undercover and discover an employee may be creating the problem.
Vlane, the owner of Action Burger in Brooklyn, contacts Mystery Diners to investigate missing comic books at his comic book-themed restaurant. Charles Stiles sends in Jamie, who discovers an employee abusing their powers for evil.
Fearing that her employees are selling the secret recipes to her raw food menu, Sylvia, owner of Beets Cafe in Austin, contacts Charles Stiles for help. Mystery Diners Holly and Robin go undercover and discover an even bigger problem.
Tired of being mistreated, the wait staff of a California restaurant contacts Charles Stiles to do a reverse sting on their employer. Mystery Diners Amanda and Eliot go undercover and uncover what's really going on inside the kitchen.
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.
After noticing discrepancies in sales, Allen, owner of ShoreFyre in Honolulu, contacts Charles Stiles to investigate. Mystery Diners Jordan and David go undercover and discover a related problem with the surf shop next door.