The first book in the series was published in October 2000; the series spent 38 weeks on the New York Times Children's Series Best Sellers List and was sold to publishers in 37 foreign countries.
Buku pertama diterbitkan bulan Oktober tahun 2000; Seri ini berada di daftar New York Times Children's Series Best Sellers selama 38 minggu dan sudah dijual kepada para penerbit dari 37 negara.