One of the book's strengths is the unique setting, which is a departure from the typical culture books. Another is the exploration of the doctor's and bodyguard's points of view. The doctor is a mysterious figure, coming from a faraway land with a cure for all diseases and rebellious medical methods. The bodyguard, on the other hand, is obsessed with protecting the head of state in his own kingdom.
However, the book also has its weaknesses. The plot is rather weak, with the dukes' childish plots becoming tiresome. Additionally, the unsatisfactory ending fails to tie up all the loose ends and leaves the reader with a sense of disappointment. Overall, Inversions is one of the weakest books in the culture series, and I would rate it 2.5/5 stars.