The Ninth Guest — Jennifer St. Clair

When Ophelia's family decides to open up their castle for guests, Jacob is invited to join in on the fun. 'Spend the night in a vampire's castle and live to tell the tale' is supposed to be a fund-raiser to help Ophelia's family pay the bills. (It costs quite a bit to heat a castle, after all.) But when the truth of an old secret is uncovered, what began as an innocent business venture soon turns deadly when the vampire hunters get involved. For years, the vampire hunters have had only one goal: Destroy All Vampires. And with the help of a new friend, Jacob and Ophelia must work together to save Ophelia's entire family from extinction.