Hillary Clinton announced Thursday her forthcoming book about the 2016 presidential election will be titled "What Happened."

Publisher Simon & Schuster will release Clinton's book Sept. 12. The company released a preview of the introduction in which Clinton states she is ready to talk about an election year that was "marked by rage, sexism, exhilarating highs and infuriating lows, stranger-than-fiction twists, Russian interference, and an opponent who broke all the rules."

"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 guard down," Clinton writes.

The former secretary of state and first lady will also talk about the "challenges of being a strong woman in the public eye, the criticism over her voice, age, and appearance, and the double standard confronting women in politics."

The book will also address how Clinton coped following the unexpected loss and "found the strength to pick herself back up afterwards."