London has almost recovered from Jack the Ripper's killing spree, when another grisly murder puts the city on high alert. A flower seller with a psychic gift, Constance Piper was a friend to two of the victims, and with the supernatural help of her late mentor, Miss Emily Tindall, she uncovers links between the murders and a Fenian gang which uses violence to further its goal of an independent Ireland. Following The Angel Makers, Constance's third outing finds her joining with police detective Thaddeus Hawkins to track a serial killer and thwart a conspiracy that runs from Whitechapel to the highest office in the land.