When beautiful, wealthy Yukiko and low-born artist Noriyoshi are found drowned together in a shinju, or ritual double suicide, everyone believes the culprit was forbidden love. Everyone but newly appointed yoriki Sano Ichiro.

Despite the official verdict and warnings from his superiors, the shogun's Most Honorable Investigator of Events, Situations, and People suspects the deaths weren't just a tragedy -- they were murder. Risking his family's good name and his own life, Sano will search for a killer across every level of society -- determined to find answers to a mystery no one wants solved. No one but Sano...

Set in 1689, it evokes the Japanese society and culture.
Sometimes I thought Sano's self reflections are coming a bit abruptly, but the book does a great job of introducing you to Japan.

Not read yet but looks interesting.