Lady Rattery

In the novel Sad Cypress, Lady Rattery is mentioned. She is the sister of Sir Lewis Rycroft. Lady Rattery does not appear in person, but is mentioned in a letter from Nurse O'Brien to Nurse Hopkins. From the context of the letter it appears that at that time Lady Rattery is the employer of Nurse O'Brien. O'Brien is taking care of someone in the household with double pneumonia. O'Brien mentions that she has seen the same photograph the Laura Welman had depicting Sir Lewis.