Sue Townsend was working on a new Adrian Mole book, entitled Pandora's Box, it has been revealed.
The latest in the hugely popular series was due to be published this Autumn, and publishers Michael Joseph have confirmed that they had already taken delivery of some of its pages.
The book - named after the long-running character Pandora Braithwate - would have been the 11th in the series, following 2009's The Prostrate Years.
Author JK Rowling said she was sad to hear about the death of Sue Townsend, who gave her "so many laughs".
So sad to hear about Sue Townsend. She gave me so many laughs. #AdrianMoleWillLiveForever
The chief executive of Sue Townsend's publisher, Penguin Random House UK, paid tribute to Adrian Mole author Sue Townsend this morning.
Tom Weldon said Townsend's view of the world was "generous, life affirming and unique" and she would be remembered as one of the UK's great comic writers. He said:
"Sue Townsend will be remembered as one in a handful of this country's great comic writers. We were so proud to be her publishers.
"She was loved by generations of readers, not only because she made them laugh out loud, but because her view of the world, its inhabitants and their frailties was so generous, life affirming and unique".
Comedians Sarah Millican, Stephen Mangan, and TV personality Gok Wan have taken to Twitter to pay tribute to Sue Townsend, who is reported to have died yesterday aged 68.
Such sad news about Sue Townsend. Just about to start reading 'The Woman Who Went to Bed for a Year'. Will do so now with a heavier heart.
Deeply saddened to hear the hugely talented Sue Townsend has died. My thoughts are with her family. Adrian Mole was a big part of my youth x
Greatly upset to hear that Sue Townsend has died. One of the warmest, funniest and wisest people I ever met.
Novellist Sue Townsend, best known as the author of Adrian Mole book series, died yesterday after a short illness, according to reports.
Townsend, who was left blind after suffering from diabetes for many years, achieved worldwide success after the publication of her best-known work, The Secret Diary of Adrian Mole, aged 13 3/4, in 1982.
Novellists Ian Rankin and Bali Rai are among writers on Twitter who have paid tribute to the author of the Adrian Mole series Sue Townsend, who is reported to have died aged 68 today.
BBC Radio 4 midnight news confirms news of Sue Townsend's death. A real loss.
Just been informed by her family that my hero, @suetownsends has passed away. Utterly shocked and saddened. An amazing woman is gone.
Novelist Sue Townsend, best known as the author of the Adrian Mole books, has died aged 68, according to reports today.