The author of 'To Kill a Mockingbird' has released her first book for more than 50 years.

Harper Lee is bringing back the original characters in the follow-up 'Go Set A Watchman'.

It's one of the most anticipated releases of 2015 - and some bookshops have opened all night to cope with demand.

But former literary editor of The Times newspaper, Erica Wagner, says it's hard to easily sum up the timeline compared to the original: