When chef Chai, owner of his namesake restaurant in Honolulu, notices multiple ticket voids, he contacts Charles Stiles for help. Mystery diners go undercover to see if his staff are making honest mistakes or committing foul play.

The owner of Cookin' With Lenny Smokehouse in Los Angeles, fears that someone on his staff is using restaurant supplies to operate a competing catering company.

The owners of Fenders Moto Cafe and Brew Pub in Portland, Ore., notice some of their valuable motorcycle memorabilia has gone missing.

After noticing a discrepancy in supplies, Ghaith and Tiffany, owners of Dar Salam in Portland, Ore., fear a new Iraqi food cart that's competing with their restaurant is related to the problem. Charles sends in Mystery Diners Jamie and Brianna to investigate.

A dip in memorabilia sales at the Rock Island Cafe in Honolulu worries the owner, who contacts Charles to investigate whether his staff is to blame.

Rod and Linda, owners of a la carts Food Pavilion in Portland, Ore., hear complaints from their tenants about the new onsite manager so mystery diners are sent in to investigate.

The owner of Tavern on Main outside of Los Angeles, fears someone on his staff is stealing donations from his restaurant's annual Thanksgiving Food Drive.

The owner of Cha Cha Cha Salsaria in Honolulu asks Charles to investigate rumors of an unauthorized boat delivery service.

After noticing discrepancies in sales, Allen, owner of ShoreFyre in Honolulu, contacts Charles to investigate. Mystery Diners Jordan and David go undercover and discover a related problem with the surf shop next door.

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.

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.

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.