Julia and the master of Morancourt / Janet Aylmer.

Enhanced descriptions from Syndetics:

From the author of Darcy's Story comes a novel of romance, family tragedy, and intrigue in a volatile England at the end of the Napoleonic Wars.

Julia Maitland had an idyllic childhood with her brother and younger sisters on her family's estate in rural Derbyshire. Upon reaching marriageable age, she looked forward to everything that her new status could bring: the excitements of her first "season" in society, a choice of handsome suitors, and--hopefully--a blissful future with a man she cherishes.

But Julia's prospects take a disastrous turn with the sudden and unbearably tragic death of her soldier brother in the war against Napoleon and the loss of her father's investments. Within the span of a few weeks, she finds herself in London, then fashionable Bath, and ultimately chasing smugglers through the countryside in coastal Dorset. Yet through all the drama and turmoil she keeps alive her hopes for happiness and a love passionate, powerful, and true.