When Nell Sweeney, an Irish girl with a rather dubious (and mostly unexplained, in this book) past assists her physician employer during a difficult birth in 19th century Massachusetts, she has no idea what she is getting into. The pregnant woman is a chambermaid for a Boston Brahmin family, and the child is adopted by them. Nell is hired away to be the child's governess almost at once.When baby Grace is about three years old, the family is embroiled in scandal as their eldest son, William, is accused of murder. William had been presumed dead at Andersonville ... but is very much alive. Nell's employer sets her the task of finding a way to prove William's innocence -- despite mounting evidence of his guilt.A well constructed and entertaining "whodunnit" that kept me guessing the entire time.