In present-day London, an elegant woman in leather coat and shades cases out government buildings in Whitehall. She recruits two accomplices: a doorman at the Cabinet Office and a disgruntled former employee with a penchant for briefcases.

Later, wearing a fur coat and jewels, the woman is admitted to the Cabinet Office building by the doorman she has recruited. She departs in the company of a government minister, who tells her that he is a great believer in the arts. They go to the Royal Opera House, where the doorman is waiting outside. The woman secretly passes him an envelope, and she and the minister go in and take their seats in the auditorium.

The doorman meets the briefcase man on the South Bank, and passes on the envelope and his bicycle. The briefcase man rides off, and is next seen in an indoor ice rink. He hands the envelope to a skater in black, who writes something on it and returns it.

Back at the Opera House, the minister has dozed off. The woman takes the opportunity to slip outside and collect the envelope from the briefcase man. Returning to the auditorium, she slips it into the sleeping minister's portfolio.

On television news, it is revealed that the government has been withholding information on a massive scale. The woman and her two accomplices meet up on the South Bank and perform a pas-de-trois re-enacting their activities.