I really like the concluding paragraph of the review:
If you read enough biographies, you realize that the genre has a fatal flaw, a system error: Every person is unknowable, not least of all to themselves. There is, in everyone, some small cinder of truth that never sees the light of day. Biographers pretend that this cinder can be revealed, and that order can be imposed upon an unruly life. That’s a lie. Ann Marks hasn’t solved the mystery of Maier—why would we want her to? The photographer’s mystery remains intact, suffusing the thousands of indelible images she left behind in those storage lockers. It’s better to look there for the truth of her life, in those pictures of the world that she put away, as if she saw, and understood, what the rest of us never would."