On the evenings between Christmas and New Year's, Adelaide, Eleanor, and Beatrice congregate by the fire to tell ghost stories and perform Yuletide divinations. A series of odd messages begin to arrive, the strangest landing on their doorstep on New Year's Eve. A young waif brings them a mysterious woman who tells the witches that she's in search of Mr. Palsham, a man they had hoped they put behind them. As Gilded-Age New York prepares to ring in the new year, the witches hunt for a dangerous man who may be more than human, and who may just be the end of the witches.