Mixed Magics (The Chrestomanci Series, Book 5) by Diana Wynne Jones
An anthology of four short stories, featuring Chrestomanci and many familiar friends and worlds from the novels.
The titles are: Warlock at the Wheel, The Sage of Theare, Carol Oneir's Hundredth Dream and Stealer of Souls.
Carol Oneir's Hundredth Dream has never been published in the UK before.
Stealer of Souls is a long-awaited, completely new, never previously published story.