Kedakaki Yakusoku summary:

Katherine's hope for her beloved brother's return to their estate in Hampshire is dashed when she receives the news of his death... He met a brave death at Battle of Waterloo. Then cruel reality hits devastated Katherine. Her uncle's family claims the estate, leaving Katherine no access to her fortune. The only person she can turn to for help is Lord Adam Calthorpe, her late brother's superior. Little does she know her brother asked Adam to look after Katherine if any ill fate were to befall him....