Art heist mysteries are always enjoyable because I know very little about the art world. It seems to be populated by shady characters in general because of the big money thrown at artwork, the subjective nature of valuation, and the apparent ease (and profitability) of selling forgeries to gullible, naive buyers.
Then throwing an interesting uncle-niece detective team into the mix makes for a refreshing read. Henry and Janet Lau, the detectives, are both rather reserved people except for Henry's obsession with the martial art known as Wing Chun kung fu. His character reminds me of a smaller, more reserved, polite, by-the-book version of Jack Reacher. Henry never seems to invite trouble. But it seems to seek him out. When it does, he usually comes out on top. However, like Reacher, he gets banged up now and then.
Mallory shows solid mystery writing chops. His prose is toward the lean side but effectively tells the story. He doesn't throw too much Wing Chun terminology at us--just enough that a layperson can understand the basics. His plot was well constructed, with some good subplots and red herrings. And it's always a pleasure to read stories set in my old stomping grounds, the Twin Cities.