The book ‘What Happened’ was written by Hillary Clinton. ‘What Happened’ is a memoir about her experiences as the Democratic Party’s nominee for president of the United States in the 2016 election. The book was published on September 1, 2017, it is her seventh book with her publisher, Simon & Schuster. The book sustains an intimate view of what it was like for Clinton to run as the first female presidential candidate from a major party in US history.