This is not your average book of fairies, and is not really aimed at younger children, but I think older kids and adults would enjoy.
It's presented as a collection of letters and notes from various historical characters who are replying to correspondence from Lady (Angelica) Cottington (we don't see her letters) regarding the fairies which she delights in squishing between the pages of her books. The illustrations are charming and funny - some of the fairies have been pulling faces as they were squished, some are very pretty, whilst others are all nostrils and tongues like a face pressed against glass! Angelica quite often comments on how useful each squishing has been for sticking the letters into the book with.
The letters themselves are printed as if handwritten and are contained in various envelopes and fold-outs within the book. Each refers to their own writings and experience of the supernatural and the letter itself and accompanying mementos reflect the character of the writer. Oscar Wilde's note is scribbled on a menu, and Sir Arthur Conan Doyle's is accompanied by a bill from a spiritualist (on the back of a receipt for a wax hand, some black thread and luminous paint).
I've given four stars instead of five because there's no real narrative going through the book - it really is just a collection of letters which are amusing if you recognise the (both real and fictional) authors. There is a faint thread running through about Angelica trying to contact her mother which I found a bit sad and off-putting, and I found it difficult to read some of the more scribbley letters fluently. That said it is a charming and really beautifully illustrated book and I'd highly recommend it for anyone who enjoys the lighter side of the supernatural.