Jo-Emma Larvin navigated through London's Heathrow Airport on a fateful day in August 2020, pushing a cart laden with seven suitcases. Traveling business class to Dubai, Larvin and her companion passed through security, seemingly no different from the throngs of other travelers. Yet, unbeknownst to airport authorities, her bags held a clandestine cargo: millions of British pounds, wrapped in rubber bands and sealed in plastic.