A Spy's Devotion by Melanie Dickerson
A Spy's Devotion #1, in the Regency Spies of London series, by Melanie Dickerson
Nicholas Langdon is a wealthy well connected British officer who has returned home to heal after a battlefield injury. He had made a promise to fill a soldiers last dying wish and deliver a coded diary. He attends a lavish ball at the home of the Wilherns, known as one of England's most powerful families, where he meets their beautiful and intelligent ward Julia Grey. The diary is stolen and in route to find it, he uncovers a to a plot to devastate the nation of England. Will the Nicholas and Julia work together to save their country?