Is there a sequel to graceling?

Yes, there is a sequel to Graceling! It's called "Fire" and it was published in 2004. It continues the story of Katsa and Po, exploring their relationship and the political landscape of their world.

There's also a prequel called "Bitterblue" published in 2012, which focuses on Bitterblue, the daughter of the tyrant King Rhen.

So, you have three books in the Graceling Realm:

* Graceling (2003) - The original story

* Fire (2004) - The sequel to Graceling

* Bitterblue (2012) - The prequel to Graceling and Fire