I have read Jennifer Chiverani's book also. It inspired me to search out and read Elizabeth Keckley's book. I found that Jennifer's novel closely followed Keckley's account. I have also read Jean R. Baker's Biography on Mary Todd Lincoln. In ts she quotes several times directly from Elizabeth Keckley's memoirs. I enjoyed the books tremendously. Another book I would recommend is one on the "other Civil War first Lady" Varina Davis - Jefferson Davis's wife. it is "First Lady of the Confederacy, Varina Davis" by Joan E. Cashin. Elizabeth Keckley is also quoted as in the Biography. If schools would mention more on these real life people, history would be so much more interesting!