ABOUT THE CHRESTOMANCI SERIES
Want to read everything ever written about Chrestomanci and his worlds? Here's a run-down of the series, more or less in publishing order:
The Magicians of Caprona
published 1980
post-Charmed Life
Witch Week
published 1982
post-Charmed Life
The Lives of Christopher Chant
published 1988
pre-Charmed Life
Conrad’s Fate
published 2005
pre-Charmed Life, post-The Lives of Christopher Chant
The Pinhoe Egg
published 2006
post-Charmed Life
short stories:
"Warlock at the Wheel"
"Stealer of Souls"
"Carol Oneir’s One Hundredth Dream"
"The Sage of Theare"
all presumably post-Charmed Life
Personally I favor The Lives of Christopher Chant and Conrad's Fate, but if you're really interested in the characters and the storyline, you should check out all of these, including the short stories. Of course, my favorite of the entire series is Charmed Life--but you probably already guessed that.