What series of young adult vampire-themed fantasy novels ninth volume was published on October 25, 2011?
Destined (Cast novel):  The book was published on October 25, 2011 by St. Martin's Press, an extension of Macmillan Publishers. House of Night: House of Night is a series of young adult vampire-themed fantasy novels by American author P. C. Cast and her daughter Kristin Cast.
House of Night