The sorcerer heir - Cinda Williams Chima

Old
friends and foes return as new threats arise in this stunning and
revelatory conclusion to the beloved and bestselling Heir Chronicles
series.

The delicate peace between Wizards and the underguilds (Warriors, Seers,
Enchanters, and Sorcerers) still holds by the thinnest of threads, but
powerful forces inside and outside the guilds threaten to sever it
completely.

Emma and Jonah are at the center of it all. Brought
together by their shared history, mutual attraction, and a belief in the
magic of music, they now stand to be torn apart by new wounds and old
betrayals. As they struggle to rebuild their trust in each other, Emma
and Jonah must also find a way to clear their names as the prime
suspects in a series of vicious murders. It seems more and more likely
that the answers they need lie buried in the tragedies of the past. The
question is whether they can survive long enough to unearth them.