In an alternate New England of 1900, where the Brotherhood dominates and controls society, sixteen-year-old Cate Cahill has struggled since her mother's death to keep secret that she and her younger sisters are witches, but when a governess arrives from the Sisterhood, everything changes.

"In the final book in the Cahill Witch Chronicles, the Sisters' and the Brotherhood near all-out war as an epidemic breaks out in New London, and the prophecy that one sister will murder another comes ever closer to fruition"--