Patricia Clapp

Emily was a selfish, willful, hateful child who died before her thirteenth birthday. But that was a long time ago.

Jane is nine years old and an orphan when she and her young Aunt Louisa come to spend the summer at Jane's grandmother's house, a large, mysterious mansion in Massachusetts. Then one day . . . Jane stares into a reflecting ball in the garden—and the face that looks back at her is not her own.

Many years earlier,

...

An eighteen-year-old English girl finds her loyalties divided and all her resources tested as she and her friends experience theterrible physical and emotional hardships of the forty-seven day siege of Vicksburg in the spring of 1863.