The Letter
Janis Susan May

Antonia Carstairs is reduced to being a companion to her cousin, reclusive Marianne Marchworthy. While cleaning out the late Lady Marchworthy's room Antonia discovers a letter proving Marianne's mother deliberately destroyed her romance with Robert Wickerham, now Duke Edenthorne. Impulsively Antonia writes the Duke, setting in motion an unexpected chain of events that forever changes not only her cousin's life but her own.