Les Mondes de Chrestomanci, tome 6Diana Wynne Jones2000

Mixed Magic is a spellbinding collection of four stories featuring Chrestomanci and many familiar friends and worlds from the novels.
In the worlds of Chrestomanic, being able to use magic is a disctinct advantage. But ordinary people have rights too‚ and only the strength and special skills of a nine-lifed enchanter can possibly begin to control the exploits of the numerous witches and warlocks‚ sorcerers and necromancers out to make mischief. The four stories in Mixed Magics all feature the enigmatic Chrestomanci‚ taller and more impossibly handsome than ever. With him are many old friends‚ as well as a number of new acquaintances‚ and a particularly devious enemy with an outrageously despicable plot!

Titre original : Chrestomanci, book 6: Mixed Magics (2000)