Lady Helen has retreated to a country estate outside Bath to prepare for her wedding to the Duke of Selburn, yet she knows she has unfinished business to complete. She and the dangerously charismatic Lord Carlston have learned they are a dyad, bonded in blood, and only they are strong enough to defeat the Grand Deceiver, who threatens to throw mankind into chaos. But the heinous death-soaked Ligatus Helen has absorbed is tearing a rift in her mind....

Sixteen-year-old Nathalie Baudin, the writer of a newspaper's daily morgue report, must use her supernatural visions to discover the identity of a killer targeting the young women of nineteenth-century Paris.