March is the story of Mr. March (from Louisa May Alcott's Little Women) during the time he leaves the family and goes to fight in the Civil War. It paints a much more multi-faceted and less-rosy picture of both Mr. March and Marmee, and is loosely based on the life of Louisa May Alcott's father, Bronson.
Dewey gave this book rave reviews for it's ambiguities. She said, "I loved how absolutely nothing was black-and-white, cut-and-dried." That makes me chuckle, because I thought the book was only so-so for the exact same reason--I wanted black-and-white and cut-and-dried.
I loved Little Women, and adored the March family--particularly Marmee. But, as Brooks points out in her notes afterward, in real life nobody's that perfect. Everyone has mean thoughts and misgivings and doubts every now and then--they'd be horribly boring if they didn't!
But--at least in literature--I think I just prefer the fantasy.