The amount of attention to detail is staggering. There are long and well written chains for several choices. The world is genuinely intriguing and detailed - thought and detail are put into everything from political dynamics to how mail is sent to the complex feelings of both major and minor characters. As well, it successfully keeps the secrets of its main plot hidden in a really satisfying way - it's very cool to have a MC that is keeping secrets while others have their own, while neither party would know how the details fit together yet.