This book is an absolute gem. I first read it when I was about 11 when my mum picked it up in a book sale in WH Smith's thinking it was a child's story.
I always regretted getting rid of my copy but was lucky enough to be bought the exact printing with dust cover by my son a couple of years ago.
If you've never read it give it a try, Roald Dahl was a fan of this slim volume.
First published in 1968.