Five years after Sofia Lyon disappeared, her remains are found stuffed into the hollow of a tree bursting through the floorboards of an abandoned house in the woods. The women who loved her flock home to the North Carolina hills to face their grief.

Frankie, Sofia's twin, is in furious mourning. Poppy is heartbroken. Cass has never felt more homesick. And Marya knows something the rest of them don't. Determined to find Sofia's murderer, they share more than a need to see justice done for their friend. Each woman is haunted, bound to the next by something both cruel and kind, and now stalked by a shadowy presence they've yet to understand. Only to question, and to fear.

As Sofia's secrets unravel, so do those of the woods, and the women soon realize that Sofia might not be who they thought she was at all. And that whoever--or whatever--killed her is coming after them.