A young governess becomes embroiled in French spy intrigue, in this adaptation of a Georgette Heyer novel.

In 1783 England, King George III appoints William Pitt only 24 years old, as PM. When members of Parliament refuse to take Pitt seriously, he calls for a general election and wins. Pitt works to reform England, focusing on rebuilding the navy while across the sea in France, Napoleon Bonaparte begins his conquest of Europe.

Ann Harding plays a lovely but somewhat naive young woman who goes on a European vacation after winning a lottery. Swept off her feet by charming Basil Rathbone, Harding finds herself married before she is fully able to grasp the situation. Slowly but surely, Rathbone's loving veneer crumbles; when he casually asks Harding to sign a document turning her entire fortune over to him, she deduces that her days are numbered.