Harper Lee had planned more books, says friend Joy Brown

Fifty-five years after writing To Kill A Mockingbird, author Harper Lee is finally publishing the novel which started it all.

Go Set a Watchman was written in the mid-1950s, but Lee was persuaded by her editor to use some of the story's flashback sequences for a different novel.

It was rediscovered when her lawyer found it with the original To Kill a Mockingbird manuscript in a safety deposit box.

The novel, which is already the most pre-ordered title since the final Harry Potter instalment, will be released on 14 July.

Will Gompertz reports.