A retelling (with a few good twists, and a much more light-hearted attitude) of Romeo and Juliet.... the feuding families are Italy's most renowned magical clans, and even the fact that their city is under immediate threat of attack doesn't seem to be enough to cause them to join together... the only hope may rest in the families' children - and their very special cats. (A definite must for cat lovers!!!)
This is one of the Chrestomanci novels that the larger volumes include all together nowadays. It looks a little less daunting to have them separated, in my opinion. An older version, but very entertaining and I very much enjoyed it.