What is the author's tone in Call Me Anna: The Autobiography of Patty Duke by Patty Duke?

This book is a highly personal one that deals with the events in one life that created a whole person who is now moderately successful in her career and dealing with a newly diagnosed illness that offers an explanation for irrational behaviors in her past. This book's tone moves back and forth from a dark place filled with depression and misconceptions toward a more mature, optimistic look at the world.