This is one of the books I remember from my own childhood in the most vivid detail. I couldn't wait for my own kids to be old enough for me to read it to them - but when I was ready shock horror it was out of print. I pre-ordered this edition as soon as I saw it coming and was absolutely delighted - it's gorgeously done - a lovely bit of publishing. A high quality hardback, with a lovely cloth cover and metallic detail - a bit like Dangerous Book for Boys etc. Just super.
And the story is every bit as I remembered it. I've read it to my bright 5-year-olds and they were begging for more at the end of each chapter. I'd say the age range is from 5 (if you read to them) up to 10+ when children will hopefully be able to read for themselves. The storytelling is for me flawless - beautifully told, lovely use of language, engaging, full of suspense (of the kind children can handle easily).
Can't rate it highly enough. I've so far bought about 15 copies myself for presents etc as I think every child in the world should have a copy!