«Taken (Book #2 of the Vampire Legends)» by Emma Knight

Rachel Wood finally learns the secret that her new boyfriend, Benji, has been hiding: he is a vampire. She discovers his world in the mysterious Lyndvia Castle on the Hudson River. But just as their romance is blossoming, Benji’s twin brother shows up with a message that might mean the end for them all. Rachel will have to decide how much she wants to sacrifice to be with the love of her life.