I finished Vanish in one single shot and I'd say it's a comparable sequel. There is much less action and there's more character-building (for some) but apart from that, it's not all bad. I'm really glad we get to see a deeper side of Cassian in this. He's not just the pride heir he was made out to be; there's actually a part of him that really loves Jacinda for who she is. I didn't really like Jacinda's character this time around because she's acting all mopey over Will and it felt like she was losing her strong personality. 
 Obviously, Tamra manifesting throws a curveball to the series but really, I don't think it makes that much of a difference. I always had a feeling that would happen and the fact that Severin was being a jerk about it was something predictable too. I can't believe no one in the pride can see Severin for the bastard that he really is. Oh, and his nephew (can't remember his name), he's an arse too! 
 I didn't really mind the ending as I pretty much expected it already and it's not that much of a cliffhanger, not to me anyway. I'm definitely going to continue with the series and I do hope the mystery surrounding Will's draki blood is revealed in the next book.