In the dying days of 1850, the young detective Charles Maddox takes on a new case. His client? The only surviving son of the long-dead poet Percy Bysshe Shelley, and his wife Mary, author of Frankenstein. Charles soon finds himself being drawn into the bitter battle being waged over the poet's literary legacy. When a chance discovery raises doubts about the death of Shelley's first wife, Harriet, he starts to question whether she did kill herself-or whether what really happened was far more sinister...