Unseen Academicals
Terry Pratchett
Discworld (37)
The Very Secret Society of Irregular Witches
Sangu Mandanna
The Wonderful Wizard of Oz
L. Frank (Lyman Frank) Baum
Geist (A Book of the Order)
Philippa Ballantine
The Arctic Incident
Eoin Colfer
Artemis Fowl (2)