Allerdale (Confirmed Bachelors #1)
Jenny Hambly

After her diplomat father dies, Eleanor Edgcott returns to England heartbroken. When her mourning period is over, her cousin, Lord Haverham, brings her to Town for the season. She finds herself interested in everything and everyone about her. Between trying to plan her future, keeping Diana, Lady Haverham from the clutches of a rake, and trying to help a lovelorn couple, she finds herself with very little time for reflection.
She is drawn to Lord Allerdale but soon realises that he is the last person to meet the list of requirements she has drawn up for a husband. Circumstances draw them together, however, and just when they discover that they share a very special connection, an event occurs that threatens to ruin any chance of happiness they may have.