Undercover detectives pursue a case in which an air steward has allegedly obtained a dead person's passport and assumed a new identity.

An emergency landing disrupts the nocturnal resurfacing of a runway, while a tearful bridesmaid and a missing minister keep staff busy as the fly-on-the-wall cameras continue to roll at London's Heathrow airport.

Maria has to deal with two passengers who have been stuck at Heathrow for over 24 hours, and flamboyant cabin steward Axel jets in from Iceland.