In the last book Cassandra got the power of the pythia but there's one thing she has to do before the power is hers. There's a geis between herself and the vampire Mircea, a geis that's hurting both of them, there's another clairvoyant who wants to be pythia and several other complications in Cassandra's life.
It wasn't bad, it took me a while to remember some of the background, and in many situations I didn't get a great sense of place or time, not the best read but not a bad read. I'm not pushed to get the next book in the series but I wouldn't reject the idea of reading it.