If you are looking for an experience similar to Van Gulik's Judge Dee, this is a very good option. Solid crime novel with an historical setting, Sugawara Akitada's stories have an increased focus on characters and their relationships, but the elements of mystery, thriller, adventure, and historical "added value" is there.
I discovered the series a few years ago and have read all that is published. My favorite is "Black Arrow", but this "Island of Exiles" is good by itself and important also in the context of the overall series, since some characters will play a role in other books ("the Convict Sword").
I also enjoy the Penguin edition, as usual.