Who is sending strange, nasty messages to Mr Goon? How the tables have turned! Finally, Mr Goon is the one who needs help from the expert mystery solvers, the Five Find-Outers.

The children are quickly on the trail, but the mystery doesn't end there...The Mystery series follows the adventures of 'The Five Find Outers' - Pip, Bets, Larry, Daisy and Fatty, as they solve the most unusual crime cases with the help of their dog Buster.

Enid Blyton is arguably the most famous children's author of all time.

Thanks to series such as The Wishing-Chair, The Faraway Tree, The Mysteries, The Famous Five and The Secret Seven, she has sold over 400 million books in more than 40 languages worldwide.

Her Mysteries stories have charmed generations of children - and they are as popular today as they have ever been.