Marvin, the owner of Falls Taproom in Philadelphia, contacts Charles Stiles after hearing rumors of a feud breaking out between his girlfriend/manager and his best friend. The Mystery Diners point to bigger problems with the owner's friend and regular customer behind the rumors. Showing up intoxicated, he had been harassing customers and the manager. When confronted, Marvin ends his friendship with his friend and bans him from his bar. In his exit interview, the former friend expressed his remorse in his behavior and plans to make up for his misdeeds. Marvin later apologizes to his girlfriend, who will only forgive him if they go out shopping the next day

The father-son owners of "Star Café" and "Star Coaches" in Atlanta, worry about missing food in their kitchen and a rise in fuel expenses on their tour buses.

The owner of Nashville Street Tacos and The Stillery in Nashville, believes his part-time apartment above his restaurant is being used while he's out of town.

Rose and Tom of Belcourt Taps in Nashville contact Charles Stiles for help after hearing rumors that their songwriting contest is rigged.

After inheriting some of their staff from the previous owner, the new owners of Sam's Tavern in Seattle believe there is a divide between the old employees and their new employees. The Mystery Diners point to the manager who had been misbehaving herself with the belief that the previous owner should've made her the new owner of Sam's Tavern and had been abusing the new waitresses. During the confrontation, the manager is fired from her position. The narrator revealed that the former manager has found employment elsewhere. The old employees have been treating both their new owners and their new employees with respect.

When the owner of The Groves Bar & Grill becomes concerned over a large loss in food and supplies, the Mystery Diners go undercover with hidden cameras as new employees and customers, suspecting that a recently hired chef may be plotting more than just the items on the menu. During the sting, they reveal that the newly-hired chef is running his own catering business and using the restaurant's kitchen and supplies to run it, making business at The Groves suffer, with customers waiting extensively for their orders. The owner, as well as Charles, confronts the chef and fires him. The narrator revealed that the former chef has gone out of business without his own overhead. The owner has his food and supplies all in check, with The Groves having an improvement in business.

The owner of Stroker's Ice House, a biker bar and grill in Dallas, named Rick Fairless and his mother call in Charles Stiles to investigate a dip in revenue which may be related to Rick's motorcycle shop. The Mystery Diners point to problems with two waitresses that have been stealing money behind the manager Chris's back, and the waitress Sammi is stealing and selling motorcycle parts with her mechanic boyfriend Lobo who works at the motorcycle shop run by Rick. When the couple are confronted, they are both fired by Rick and his mother tells them to take the other waitress with them. The narrator revealed that Lobo, Sammi, and the other former waitress have found new employment. Chris has been demoted to bartender only to resign. The owner's mother has temporary come back to work and is looking for new managers.

Charles and his team investigate when the owner of "Harvey's Steakhouse" in Huntington Beach, California, notices a dip in older customers, leading to a discovery of unauthorized events being held by the staff to draw in a younger crowd.

A seller of kitchen supplies asks Charles Stiles for help, after his customers find food inside the factory-sealed appliances they just purchased, which leads to the discovery of a large-scale scam operation.

After receiving deals that are too good to be true, Tony, the owner of Rivoli's in Tom's River, N.J., believes his new meat purveyor is selling him stolen goods. Charles Stiles sends in Mystery Diner Danny, who has trouble infiltrating the restaurant staff.

After noticing missing food and merchandise, the owners of "Epic Rollertainment" in Murrieta, California, contact Charles Stiles for help. Upon investigation, the team discover an ever bigger problem, when the roller rink closes at night.

Kent, owner of Uptown Billiards in Portland, Ore., believes the social media expert he hired to promote his restaurant isn't doing an adequate job. Charles sends in Mystery Diner Amber and discovers the customers are being hustled.

A staff may be getting carried away with the digital shorts they produce to promote a restaurant and help is sent in.

Charles has a repeat customer when the owner of Capo's Speakeasy in Las Vegas, who the team helped in the past, requests a sting operation on his personal chef.

The owner of Cheesie's Pub and Grill in Chicago, Illinois is concerned about cheating with his grilled-cheese-eating contest (too many petite women among the winners) and cost of his alcohol sales. The Mystery Diners point to bigger problems with his waiter and his cashier cheating to help the female contestants win and giving away free beverages. In spite of his waiter's pleas that it was good for Cheesie's during the confrontation, he and the cashier are fired. The narrator revealed that both former employees have apologized for their actions and moved on to other jobs. The owner has implemented new rules for his grilled cheese-eating contest to discourage cheating on both the customers' and staff's part.

The owner of Source in San Francisco has concerns about meat being served in his vegan restaurant. The Mystery Diners point to bigger problems with his male cashier eating outside food at the restaurant in addition to lying to customers about meat being served, another cashier named Sydney is being rude to customers with her vegan ways, and his head chef coming in to work intoxicated while drinking booze hidden in a drink cup. During the confrontation, the male cashier storms out, the chef is forced to take time off, and Sydney is reprimanded to ease up on customers. The narrator reveals that the former cashier has found employment elsewhere. The chef is attending Alcoholics Anonymous. Sydney has adopted a more friendly approach.

Leah and Garret, owners of the Toad Tavern in Littleton, Colo., need to know if their son and his band mates are more focused on their musical aspirations than their jobs in the restaurant. Charles sends in Mystery Diners Ashley and Andy, who discover another employee may be ripping them off.

Owner suspects one of her managers after noticing over $4,000 missing from her office safe.

A drop in food and tattoo sales at the "Anchor Bar and Tattoo" in Atlanta is investigated by Charles and the team.

The owner of Gigi's Restaurant in Philadelphia, Pennsylvania is concerned with rumors about his mother and co-owner discriminating younger customers. The Mystery Diners go undercover and discover that his mother is not behind the discrimination. Instead, he discovers big problems when the waitress was behind the discrimination with the belief they are too frugal. During the confrontation, the owner calls her out for the discrimination and she is fired. In her exit interview, the waitress remained unremorseful for her actions wanting better customers who are rich to pay for her services. The owner later apologized to his mother after seeing that she was trying to repair the damage with their customers that the waitress caused. The narrator revealed that the former waitress has started working at another restaurant. The owner's mother continued to work alongside him at Gigi's.

The owners of Del Rossi's Cheesesteaks Co. in Philadelphia, Pennsylvania has been hearing complaints about their recently-hired security guard they called "Fury" (who was a family friend) being too rough with customers and being bossy with the staff. The Mystery Diners not only confirm this, but also point to bigger problems with one of their cashiers taking advantage of Fury by sneaking into the kitchen and stealing from the restaurant. During the confrontation, the cashier is fired and Fury is reprimanded and put on probation. In his interview, Fury is remorseful for his actions and promises to change his attitude. The narrator revealed that the former cashier has paid for the items he stole. Fury has adopted a more friendly approach in his job.

The owner of 55 Degree Wine and Link-n-Hops in Los Angeles, believes discrepancies at both his wine shop and restaurant are somehow related.

Brett and Rose, the husband and wife owners of German restaurant Haus Murphy, disagree on almost everything, particularly the hiring of Rose's nephew as their new restaurant manager. Fearing he is unqualified for the job, the couple hires Charles Stiles and Mystery Diners Danny, Chris, and Deanna to go undercover and show them just how incompetent their nephew truly is. After the proof is shown, this leads to the confrontation where Rose ends up having to let her nephew go from his employment.

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 sends in Mystery Diners Amanda and Andy to investigate.

Charles and the team go undercover at the Hawaii Yacht Club in Honolulu to get to the bottom of complaints about non-members being given access to exclusive dinner events.