There are 4 books in the Sisters of the Sword series.
The Sisters of the Sword series does not have a new book coming out soon. The latest book, The Battle Dawns (Book 4), was published in February 2010.
The first book in the Sisters of the Sword series, Sisters of the Sword, was published in June 2008.
The Sisters of the Sword series primarily falls into the Fantasy genre. This middle grade series was written for ages 8-12, but can be enjoyed by older readers as well.