Promises to the Dead by Mary Downing Hahn

This really good book takes place at the time of the Civil War.  It's about a 12 y/o boy who makes a promise to a dying slave woman that he will bring her 3 y/o son to a relatives house in Baltimore.  Clean, action packed, quick read.  Historical fiction but no where near boring.  This is the first book by Mary Downing Hahn that I have read.  She has written a lot of other books, but  by the covers they all look like ghost stories.  Has anyone read any of her other books?  Let me know.