Robert Reid moved his family to Scotland’s Outer Hebrides in the 1990s. But despite his best efforts to fit in, Robert is always seen as an outsider. And as the legendary and violent Hebridean storms rage around him, he begins to unravel. For her entire life, Maggie MacKay has sensed something was wrong with her. When Maggie was five years old, she announced that a man on Kilmeray had been murdered. Her unfounded claim drew media attention and turned the locals against each other, creating rifts that never mended. Nearly 20 years later, Maggie is determined to find out what really happened and what the islanders are hiding. But when she begins to receive ominous threats, Maggie is forced to consider how much she is willing to risk to discover the horrifying truth.

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.