There was a lot that I really liked about this book, and a few things that I didn't.  Since that is true about most books I read, that isn't an automatic death sentence.  I thought that Quinn was a strong, interesting character.  Intelligent, self aware and self deprecating, with a healthy dose of humor.  I'd probably enjoy being her friend, but I think I'd feel inferior to her amazing, almost unbelievable, skills.  This is the part where I discuss what I didn't like.  Wasn't it convenient that Quinn is fluent in so many Asian languages?  Wasn't it great that this talent led to her being a super secret undercover agent?  Wasn't it amazing that she can shoot a gun, kick your butt in martial arts, and tell you all about perfume base notes, middle notes and how long it will live on your skin?  Not to mention the dressage...
But this was a minor irritant.  It pulled me out of the story a bit while I was reading, but I quickly became immersed again.  The central mystery kept my attention, but what I really liked was the interaction between Quinn and her investigation buddies.  Chinatown was felt like another character in the book, adding depth and intrigue to the basic story line.  Quinn discovered quite a few surprising facts about her husband during the investigation of his death, but her faith in him never wavered.  I enjoyed The Rage of Plum Blossoms quite a bit, and will be recommending this to my reading friends!