Lady Miranda Hawthorne acts every inch the lady, but inside she longs to be bold and carefree. Approaching spinsterhood in the eyes of society, she pours her innermost feelings out not in a diary but in letters to her brother’s old school friend, the Duke of Marshington. Since she’s never actually met the man she has no intention of ever sending the letters and is mortified when her brother’s mysterious new valet, Marlow, mistakenly mails one of the letters to the unsuspecting duke.