"The year is 1870. Five years after a series of Dante-inspired killings disrupted Boston, a man is found murdered in the public gardens of London with an enormous stone around his neck etched with a verse from the Divine Comedy. When more mysterious murders erupt across the city, all in the style of the punishments Dante memorialized in Purgatory, poet Christina Rossetti fears her brother, the Dante-obsessed artist and writer Gabriel Rossetti, will...