The Sharing Knife is a romance/fantasy series by American writer Lois McMaster Bujold, published in 2006–2019. The original story grew so long in the telling that it was split into two volumes: Beguilement (2006) and Legacy (2007). Bujold then wrote a sequel, which was also divided, into Passage (2008) and Horizon (2009). The original title of the sequel was The Wide Green World, but Bujold and her publisher decided to make "Sharing Knife" the overall title, with the individual books given one-word subtitles and numbered 1–4. The fifth story in the series, a "short novel" titled Knife Children, was released as an electronic book on January 25, 2019. Source: Wikipedia (en)