Something Sinister Plots Beneath the Streets of Arkham, Massachusetts. As ex-soldier Mark Harrigan suffers haunting visions that go well beyond shell shock, psychologist Carolyn Fern begins to suspect a dark influence at work. But when a young woman narrowly escapes her dangerous cult, what she reveals will tear all three of their lives apart, even as it intertwines their destinies forever. Now, with the fate of Arkham and the world at stake, these three strangers must come together to face unspeakable horrors from beyond.