What made Harper Lee tick?
Most fans of the private, Pulitzer Prize-winning author, who died in February just shy of her 90th birthday, likely will never know.
There's one thing we do know, however.
To Kill a Mockingbird, the legacy of Nelle Harper Lee, continues to absorb - and attract - new audiences.
In 2014, Lee signed a deal with HarperCollins for the release of To Kill a Mockingbird in electronic and digital form.