Book excerpt: Celebrate the 20th anniversary of the international bestselling Spiderwick Chronicles with the first instalment in the adventures of the Grace children. After finding a mysterious handmade field guide in the attic of the ramshackle old mansion they've just moved into, the Grace children - Jared, Simon and Mallory - discover that there's a magical and maybe dangerous world existing parallel to our own - the world of faerie. The children want to share what they know, but the faeires will do everything possible to stop their secrets being revealed . . .