It Begins (The Unseen, #1)

Out walking alone one rainy night, Lucy becomes convinced that someone--or something--is following her. Spooked, she ducks into a cemetery to try and lose her stalker. Panicking in the darkness, she slips and stumbles into an open grave--only to discover she is not alone in there. . . . Lucy manages to escape, but she doesn't get away unscathed. She begins having terrifying visions and dreams--and she still can't shake the feeling of an unseen presence, always watching, waiting. . . . Who was the girl in the grave? And what has she done to Lucy?