Savigneau's biography is a great introduction to the life and writing of Carson McCullers. The book follows a logical timeline and tries to explore different angles of McCullers' personality. However, there are some questions that I have acquired from reading McCullers' works that are not addressed or are only glanced at, and this describes one of the problems I have with this biography.
Much of my interest in McCullers is derived from her writing, and while Savigneau's book is a solid biography, it didn't go deep enough into McCullers' work for my taste.
The second problem I have with the book is that it is now out-dated. The book was originally published in 1995 (28 years after McCullers' death) and one would have thought that enough research into her life and writing would have been done by 1995, but not so.
McCullers own, tho unfinished, autobiography Illuminations and Night Glare was not published until 1999, and there is at least one other book (Schwarzenbach's Das Wunder des Baums / The Miracle of the Tree) that is referred to in Savigneau's work that was published after this biography.
Still, this is a good basic reference to McCullers' life and work.