Crooked Kingdom is a rare first edition hardcover book with a dust jacket, written by Leigh Bardugo. The book is part of the Six of Crows Duology series and was published by Henry Holt and Company in 2016. It is intended for young adults and adults and is written in English. The book features a red edge paper and covers a variety of genres including adventure, fantasy, historical, and paranormal. The book is set in Europe, particularly in the Netherlands, and covers topics such as war, combat, and mythology.