Gordon Ramsay trades his signature chef knives for a state-of-the-art surveillance vehicle and cutting-edge spyware as he ventures into struggling restaurants under the cover of night.

With the help of a secret source on the inside, he gathers unfiltered evidence of the major issues facing each restaurant. This insider helps Ramsay infiltrate the restaurant after-hours for a dramatic nighttime black light kitchen investigation that reveals more filth and grossness than ever before.

By the time Ramsay reveals his identity, it's too late for staff to cover up their culinary crimes. Drastic measures are necessary to transform not only the restaurant but also the staff, because Gordon knows he can upgrade the menu and renovate the restaurant, but the most important change has to come from the staff.