The Magicians of Caprona
Caprona is a small Italian city state famous for the warring magical Montana and Petrocchi families. The story follows the youngest boys of the Montana household, Paolo and Tonino, as the feud between the families escalate. When the families fail to come together to find the spell that will save Caprona from an enemy Enchanter and the forces of other city states the younger family members band together to save the day.
I’ve read this book many times before and reviewed it here once. One of the first few Chrestomanci novels this is a highly entertaining piece of YA fantasy. It doesn’t quite hit the highs of Witch Week or Charmed Life but that may just be down to personal preference. I highly recommend Diana Wynne Jones to anyone and this is as good a starting point as any.