The Pearl Diver is the second or third Sujata Massey mystery I’ve read and I generally enjoyed it. It’s a pretty formulaic mystery: a problem falls into protagonist Rei Shimura’s lap, she tries to figure out what’s going on, in the process of which she gets into trouble and finally the solution presents itself. Amidst all that, there are lots of information about Japan (Rei is a half-Japanese japanphile), and unless Japan truly is a completely homogenous country, some of it must be inaccurate.
Massey’s mysteries are not particularly light or expertly executed but they’re enjoyable for what they are, and I’ll probably look for her others ones at the library.