Emma Jenkins lives alone - a recluse in her remote home in Portland, Oregon, no longer engaged to be married. She spends her day reading books, pouring through old diaries, recalling happier times... and hallucinating twisted characters she reads about. Then Chelsea Greene comes into her life-a mysterious woman who knows far too much about Emma. The perfect stranger. But when Emma finds out something about Greene that she shouldn't, she turns to the characters in her book for guidance. Her world begins to crumble, and its shocking secrets are laid bare. What is real? What is imagined? Who is in danger? In this gripping psychological thriller, no one-and nothing-is what it seems.