Lord Stanley Stalton is a dutiful attaché in the Foreign Office's diplomatic corps in London, who prefers his job to private pleasure and thereby draws the ridicule of his colleagues.

Instructed by Lord Radley to prepare an extensive report on American entrepreneur Jack Miller, Stalton cancels at short notice, whereupon Lady Darnmore sends him a box ticket for the opera.

The two hit it off right away and spend the rest of the evening together at a wine bar, although Stanley Chestnut is shocked to learn that Evelyn is apparently the daughter of the man who kicked him out that afternoon.

At the same time, banker Barrow files a complaint with the police after his maid informs him that a pearl necklace was allegedly stolen from Evelyn's room.

The pursuit of a pair of thieves and the fact that Lord Stanley Stalton and his alleged wife were disturbed in their sleep as a result have reached the press.

The banker couple Barrow also read these headlines and assume that Evelyn lost her innocence the night she spent with "Stanley".

Meanwhile, the jewel thief turns out to be Jean Miller, the American entrepreneur's daughter, whose nocturnal outing was only due to the desire to get away from home and experience something exciting.