The Poisons of Caux series does not have a new book coming out soon. The latest book, The Shepherd of Weeds (Book 3), was published in October 2011.
The first book in The Poisons of Caux series, The Hollow Bettle, was published in August 2009.
The Poisons of Caux 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.