I only occasionally wanted to kill Charles, which might make him the most tolerable of Quinn's male love interests. I loved Ellie a lot. A LOT a lot. I thought the little mystery was clever and neatly showed that not everyone in a household accepts sudden changes to the status quo. In all, it was a great take on the marriage of convenience plot.
On the negative side, the big mystery at the end was totally silly and felt like it belonged in a different book. Ellie reads completely differently than she did as a side character in Moon, as did her family's motivations.
Still, a significant increase from book one.