I have finished Terra Incognita and have ordered the next in the series, Persona Non Grata.
The beginning chapter or two of Terra Incognita almost put me off. Ruso's "slave", Tilla, is not well behaved and doesn't necessarily explain her behavior/actions. It leaves me to wonder why Ruso likes her. But then, he seems such a dummy when it comes to women. Together, these two make an interesting pair. The story is full of interesting characters, including an "insane", and possible murder suspect, doctor, an aide to the prefect who is their version of a spy/black ops/intelligence officer, and several interesting portrayals of some of the womenfolk.