The Red Tree — Caitlin R. Kiernan

Sarah Crowe left Atlanta, and the remnants of a tumultuous relationship, to live alone in an old house in rural Rhode Island. Within its walls she discovers an unfinished manuscript written by the house's former tenant-a parapsychologist obsessed with the ancient oak growing on a desolate corner of the property. And as the gnarled tree takes root in her imagination, Sarah risks her health and her sanity to unearth a revelation planted centuries ago...