This third book in the series differed for me in that instead of racing from one adventure to the next as in the first two books (nothing wrong with that, perfectly good space opera), it mainly focussed on one thing--Sirena's diplomatic mission to her friend's home planet. This gave the author a chance to slow down and examine and develop relationships, not just with the protagonist and her love interest, but that of her friendship with someone from a vastly different culture and race. While we didn't see a great deal of the planet itself, we did get a chance to see an alien culture in some detail, and I have to say I thought it was believable, and that Aguirre handled it really well!
By forcing the protagonist out of her usual persona as a rather spoiled jump star and into this diplomatic role, Aguirre enabled her to focus on events outside of herself rather than dwelling on what had gone before, and to mature in a way she had undoubtedly studiously avoided in her life so far. Sirena was forced to make some hard decisions and exercise considerable self control, and grew a great deal as a consequence.
Since I am reading these books back-to-back, the change of pace provided me with a chance to catch my breath, and the emotional depth in this book allowed some of the characters to be fleshed out and become more "real".
In my opinion, this was a well-crafted book, and Aguirre proved she can really write.