This novel is definitely different from her other novels though I haven't read the first few Vanza novels before this one. While most of this author's novels primarily focus on the two main characters, we do have several supporting characters to make for an interesting dynamic. On a whole, the two main characters appeared to work well with each other with more palatable amount stubbornness from the heroine and overbearingness from the hero -- not the typical excessive amount of stubbornness or overbearingness that you usually see. There are a lot of twists before the mystery comes together.
There are certain devices that were just too hard to believe but I did let it slide. Each character being able to "fake" their identities and such were a bit of a stretch but still enjoyed it.