Here is a (not so) short summary of Numbering All the Bones.
Numbering All the Bones is told from the main character's perspective, Eulinda. Eulinda was a thirteen year-old girl who was a slave during the Civil War. She had two brothers, one of them was taken away when he was little and the other brother, Neddy, ran away from home to join the Yankee army. Eulinda then finds out that he was sent to Andersonville prison. Then at the end of the war when Abraham Lincoln’s great measure reaches her home in Pond Bluff, Georgia, she is freed. Shortly afterwards, she leaves the plantation to and goes to work for an ex-Confederate soldier named Mr. Griffin. Eulinda along with several other people and Mr. Griffin begin work in Andersonville prison, finding and reburying dead soldiers. Then Clara Barton come to the prison to help with the restoration. Eulinda becomes Ms. Barton’s secretary and close friend. When Miss Barton asked Eulinda if she wanted to live in Washington D.C. with her. Eulinda said yes and moved out from the house of her distant father, Mr.Hampton and his wife Mistis. When Eulinda finds Neddy’s body, she also finds his ring (see here for more information on Neddy's ring). Eulinda decides to give the ring to Clara Barton to ensure the safe travel of another family to Washington D.C. Eulinda also journeys there with Clara Barton in the end of the book.