Diana W. Jones

These two stories detail two messes that eventually need Chrestomanci to help sort out. The Magicians of Caprona takes place in a version of Italy with feuding magical families and other treachery and is in another world entirely and Witch Week gives us a variety of interesting characters and explains that there is one event in history that allllllways has to go a certain way. While both stories spend more time with the characters and plots that need Chrestomanci than him, they expand on what we know of the related worlds and the job that can only be done by a nine lifed enchanter.