"In the past, for reasons I try to explain, I've often felt I had to be careful in public, like I was up on a wire without a net. Now I'm letting my guards down," she says.
"What Happened", published by Simon & Schuster, releases on September 12.
This is for the first time that Hillary reveals what she was thinking during one of the most controversial and unpredictable presidential elections in US's history.
Hillary also addresses the challenges of being a strong woman in public life, the criticism over her voice, age, and body, and how all women in politics confront a double standard whenever they express anger or ambition.
The election of 2016 was unprecedented and historic.
"What Happened" is the story of that campaign and its aftermath - both a deeply intimate account and a cautionary tale.
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