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.
When Chris, owner of Spring Street Smoke House in Los Angeles, notices a decrease in his valuable fat trimmings, he contacts Charles for help. Mystery Diners Amber and Grant go undercover to discover the meat of the problem.
After noticing excess lobster meat and an increase in mileage, Peter, owner of the Roll'n Lobster Food Truck in Los Angeles believes his new drivers are using his vehicle for personal errands. Charles sends in Mystery Diners Shelby and John to crack the case.