When Denton, the famous American author and expatriate in turn-of-the-century London, receives a letter from a young woman saying she's in danger and needs his help, he doubts there's anything he can do. The letter is months old, and was only forwarded to him when the buyer of a painting found it stuck behind the frame. But why did she hide the note instead of sending it? The search for answers leads Denton into the heart of Bohemian London---the world of artists and their models, of brilliance and depravity, where the border between genius and madness is hard to discern but easy to cross. And before he has learned the shocking truth, Denton will discover what it's like to be the object of a lethal obsession and endure a terrifying confrontation with his own demons.