Kelley Armstrong (born 14 December 1968) is a Canadian writer, primarily of fantasy novels since 2001.She has published twenty-one fantasy novels, thirteen to date in her Women of the Otherworld series, two in her Cainsville series, six in her Darkest Powers series and one in the Age of Legends series. She has also published three middle-grade fantasy novels in the Blackwell Pages Trilogy, with co-author Melissa Marr. As well, she is the author of three crime novels, the Nadia Stafford trilogy.