It is said that the Haddesleys have too much of the bog in their blood to live in the world. Living an isolated existence in the Appalachians, they observe strange rituals and worship the forest and mud that surrounds them.

When Charles, the patriarch of the family, reveals he is dying, his children rally around him, only to find their fraying bonds tearing apart one by one, and their beliefs upended. For Wenna, the only Haddesley to have ever escaped the forest, it means coming home to face difficult truths. For Charlie, the eldest son, his father’s death means facing up to new, terrifying responsibilities.

Because the bog is waiting, ever-growing, ever-hungry, and if the Haddesley children aren’t careful, they will awaken something they have tried to keep at bay for a century.