Lackluster dinner sales and a dip in bottle service concern the owners of "Supperclub" in Los Angeles, who, after contacting Charles and his team for help, become aware that some of their staff are using a street vendor to line their pockets.

An elaborate con is uncovered, when Charles and his team investigate a Russian chef, on behalf of an aspiring restaurateur, who's thinking about becoming his business partner.

The owner of a meal-delivery service wants Charles to investigate several complaints from customers, which leads to the discovery of a big problem inside her kitchen.

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.

A decline in sales every holiday season is investigated by Charles and the team, during an undercover operation at "Smokin' Barrel" in Hoboken, New Jersey, which turns up a suspicious sidewalk solicitor.

The owner of a comic book-themed restaurant in Brooklyn discovers an employee is abusing their powers for evil.

Complaints about a Brooklyn restaurant's valet service prompt an undercover investigation, during which an unauthorized car wash is discovered.

In this special episode of Mystery Diners, Charles Stiles and his undercover team risk it all to bust the boss! For the first time ever, the sting is conducted from inside the restaurant to see if the horrifying accusations against the boss are true.

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.

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.