Growing up in rural Georgia, Susannah and her twin, Marina, could silently communicate in a secret language they called "nightspinning." But as they grew older, the twins became estranged. Now Marina is the victim of a brutal murder, and Susannah can hardly bear the guilt of their recent separation. When Susannah experiences a series of inexplicable events--a funeral flower arrangement sent anonymously, the sound of someone humming a childhood song in the dark, a lock of hair taped to her mirror--she learns that similar events preceded Marina's murder. Is she going crazy? Or is Marina trying some form of nightspinning from beyond to warn her or seek revenge?