Autumn 1797.  With Napoleon’s forces sweeping through Europe, a young Englishwoman travels to Paris, risking her life on a secret assignment that may buy England vital time.  Mary Finch is no stranger to adventure, but even she hesitates before accepting this new charge.  She must rely wholly upon a stranger, while deceiving her ‘dearest friend’, Captain Robert Holland.  Once in France, Mary’s safety rests on a knife-edge, and her colleague has secrets of his own.  Undaunted, and with a potent combination of wit, determination, and courage, she sets about her task, only to learn that hers is not the only British undertaking in Paris, and hers not the only British life in jeopardy.  As implacable enemies join forces against her, Mary may lose everything she holds dear.