Harper Lee, author of 'To Kill a Mockingbird,' to publish a second novel

For more than half a century, “To Kill a Mockingbird” has stood apart as a singular American literary masterpiece, a perennial best seller that has provoked countless classroom discussions about racial and social injustice.

Its author, Harper Lee, retreated from the spotlight and never wrote another novel.

Lee, 88, says she's releasing a sequel of sorts to “To Kill a Mockingbird,” featuring an aging Atticus Finch and his grown daughter, Scout.

Here's the catch. The novel was completed in the mid-1950s before she wrote "To Kill a Mockingbird" and was recently rediscovered. The sequel is called “Go Set a Watchman," according to the New York Times.

Read more from the New York Times.