Amidst the storm of the Franco-Prussian War, a desperate woman makes a perilous gamble. The enchanting Miranda Valmont, with her dying mother's fate hanging in the balance, approaches the enigmatic and impossibly wealthy Earl of Kyleston with a most unladylike proposal.

The Earl, weary of scheming London society and staying in Paris to escape the advances of Lady Irene, is intrigued by Miranda's audacity and decides to help her, but when her mother dies, the Earl insists that Miranda should return with him to England. Yet before they can leave, the Earl is injured in a riot outside the Opera House and while he lies unconscious, the Siege of Paris begins and their hoped-for escape seems destined to fail.

Trapped within the city's walls their only hope is a daring and audacious plan. But will their escape deliver them to freedom, or into the arms of something more perilous that the siege itself?