Maggie Mackay has been haunted her entire life. No matter what she does, she can’t shake the sense that something is wrong with her. And maybe something is. When she was five years old, Maggie announced that a man on the remote island of Kilmeray in Scotland’s Outer Hebrides --- a place she’d never visited --- was murdered. Her unfounded claim drew media attention and turned the locals against each other, creating rifts that never mended. Now, nearly 20 years later, Maggie is determined to discover what really happened and what the villagers are hiding. But everyone has secrets, and some are deadly. As she gets closer to the horrifying truth, the island’s legendary and violent storms begin to rage again, and Maggie’s own life is in danger.

Cat lives in Los Angeles, far away from 36 Westeryk Road, the imposing gothic house in Edinburgh where she and her estranged twin sister, El, grew up. As girls, they invented Mirrorland, a dark, imaginary place under the pantry stairs full of pirates, witches and clowns. These days Cat rarely thinks about their childhood home, or the fact that El now lives there with her husband, Ross. But when El mysteriously disappears after going out on her sailboat, Cat is forced to return to 36 Westeryk Road, which has scarcely changed in 20 years. The grand old house is still full of shadowy corners, and at every turn Cat finds herself stumbling on long-held secrets and terrifying ghosts from the past.