Harper Lee: What We Know About Surprise 'Mockingbird' Sequel

Harper Lee wrote "Go Set a Watchman" in the 1950s.

— -- "To Kill A Mockingbird" fans were shocked today to learn its author, Harper Lee, has another book coming out.

"Go Set a Watchman," the Pulitzer Prize-winning author's second novel, will be released on July 14, the Associated Press reported.

Here is what we know about the surprising sequel:

When was it written?

Lee wrote "Go Set a Watchman" in the 1950s. According to a statement issued by HarperCollins, the book's publisher, Lee said, "It features the character known as Scout as an adult woman, and I thought it a pretty decent effort. My editor, who was taken by the flashbacks to Scout's childhood, persuaded me to write... from the point of view of the young Scout."

How long is it?

The publisher says the 304-page long book will be released as originally written, without revisions.

How many copies will be printed?

Two million copies are slated to be released.

Will it be available on electronic devices?

It will. Just last year, Lee allowed "To Kill a Mockingbird" to be released as an e-book.

The Associated Press contributed to this report.