Bookworm

This is the second book about Opal the glass magician. Genre: Fantasy.

Opal has to prove that Ulrick and Devlen has switched souls, but the master magicians find it hard to believe, and there are also politics involved. However, Opal has a good friend in Janco, and Quartz the horse, and then there is Kade the Stormdancer...

Recommended, but start from the beginning with the Yelena books (Poison Study, Magic Study, Fire Study) and the first Open book (Storm Glass).

The main character is female and perhaps the reader should also be. I wouldn't know - I always read as a female.