One day after formally declining to throw her hat in the ring for California governor, Kamala Harris has unveiled her new memoir, a book following the tumultuous 107-day campaign for president in 2024.

My new book is a behind-the-scenes look at my experience leading the shortest presidential campaign in modern history, Harris wrote. The tome, titled 107 Days, will be published by Simon Schuster on Sept. 23.

Since leaving office, Ive spent a lot of time reflecting on those days, talking to my family, my friends and pulling my thoughts together. In essence, writing a journal that is this book, Harris said in a video revealing the title. I believe theres value in sharing what I saw, what I learned and what I know it will take to move forward. The 2024 Democratic nominee for president has kept a relatively low profile since leaving the vice presidents office in January as the Biden administration made way for Trumps team. Harris signed with Creative Artists Agency earlier this year with plans to focus on speaking gigs and publishing opportunities. (Biden also inked with CAA after leaving office.)

Harris had previously authored two books, 2009sSmart on Crime: A Career Prosecutors Plan to Make Us Safer(Chronicle) and 2019sThe Truths We Hold: An American Journey(Penguin Random House), ahead of launching a presidential campaign in 2020 and then serving as vice president for four years.

Throughout the spring, contenders for the governors race in California eyed whether Harris would jump in to the race to succeed Gov. Gavin Newsom, given that the politician would have become an immediate frontrunner. But ultimately Harris decided against running for state office, which could keep options open for future national campaigns.

In recent months, I have given serious thought to asking the people of California for the privilege to serve as their Governor, Harris wrote in a statement on July 30. I love this state, its people, and its promise. It is my home. But after deep reflection, Ive decided that I will not run for Governor in this election.