Well, his publisher gave up on it, but this is self-published. So was the Twenty Palaces prequel, which is just called Twenty Palaces. (I just finished the prequel and recommend it. It DOES show a little bit of the roughness of self-publishing -- the occasional typo or pronoun flub -- but it also shows the skill and confidence of a guy who's already got several published books under his belt.)
Always happy to hear about more Twenty Palaces (and more Connolly in general); I'll definitely be checking it out.
I'm not sure if the Amazon version is DRM-free or not, but the Smashwords version should be. (And here's a Smashwords link for Twenty Palaces, too, not for nothin'.)