Mark Twain’s autobiography, shut inside a vault for 100 years since his death in 1910, will finally be published.

The author of “The Adventures of Tom Sawyer,” “The Prince and the Pauper” and the iconic ‘The Adventures of Huckleberry Finn” left 5,000 pages of his memoirs at the University of California at Berkeley under orders that they not see the light of day for a century, reports the Independent.

Why he want to keep scholars and literary devotees waiting for so many years?

Many speculate that the pages are filled with criticism of the politics of the day, of his former lovers and views on God.

“There is a perception that Twain spent his final years basking in the adoration of fans. The autobiography will perhaps show that it wasn’t such a happy time,” the historian Laura Trombley told the Independent. “He spent six months of the last year of his life writing a manuscript full of vitriol, saying things that he’d never said about anyone in print before. It really is 400 pages of bile.”
There is a perception that Twain spent his final years basking in the adoration of fans,” historian Laura Trombley said. “The autobiography will perhaps show that it wasn’t such a happy time.”

It was at Twain’s request that the revealing tome, which was written during the months leading up to his death, not be published until a century after his passing. Although no one knows for sure why he made such a demand, it could be related to what he had to say about the people and the times in which he lived.