Marianne's Misanthrope (The Charity School #4)
Sarah Waldock

Marianne’s cousin Cornelius insists that she write to him monthly, and though their correspondence does not begin in an auspicious manner, the exchange of letters soon builds up an easy camaraderie. When Marianne finally has the chance to meet Cornelius, she finds there are many surprises in store, as well as a return of the unspeakable Sir Robert Morley.