When vampires from a magical alternate reality cross over into Fallon's world, she must join forces with her doppelganger, Lennox, to prevent the vampire uprising from destroying her home as it did Lennox's. Using sass, magic, and a whole lot of wooden stakes, Fallon and Lennox must accept the strengths and weaknesses in each other and in themselves, or risk losing humanity - and the life of the man they both love - to a horde of blood-thirsty monsters.