Puffin, London, 1991, 1st pr thus.  ISBN 0-14-034282-6.  MMPB, 144 pages.  Wraps show some edge and cover wear, some scratches and colour chips; remainder mark on bottom edge; binding tight.  Interior clean and unmarked with tanning pages; black & white illustrations by Wendy Smith; chapter book.  ‘Set in the Unexpected School on top of Hurricane Peak and in the city of Hookywalker below, this blood-and-thunder story abounds with villains.  Other characters include an inventor, an adopted aunt and a tartar of a principal, a boy and girl in need of education, a cat masquerading as head prefect and a schoolteacher who is a practising magician – not to mention smaller but none the less vital roles played by pupils, and inquisitive postman and two school inspectors hopelessly out of their depth.’ (from rear wrap)