Ooh this is hard, but off the top of my head

The Ancient Future - Traci Harding
Child of the Pheonix - Barbara Erskine
Into The Wildnerness - Sara Donati
Artemis Fowl - Eion Colfer
Harry Potter and the Order of the Phoenix - JK Rowling
Narnia Chronicles (as a whole) - CS Lewis
Charlottes Web - EB White
The Black Jewels Triliogy - Anne Bishop
The Troy Game series - Sara Douglass
Flowers In The Attic - Virginia Andrews
Message From Nam - Danielle Steel