Plot summary
Two New Englanders, John Branner and his friend Griswell, travel across the South and spend the night in a deserted plantation manor. Griswell awakens from a dream about a yellow-faced creature looking at him. He then sees Branner walk up the stairs in a trance. He is horrified when Branner returns as an animated corpse, gripping the bloody axe that had split his skull. Griswell flees into the woods.
In his flight, he meets the county's sheriff, Buckner, who investigates the house and finds Branner motionless on the floor. Griswell is implicated in his friend's murder, but the sheriff gives him the benefit of a doubt and tries to clear his name. Buckner gives some credence towards Griswell's bizarre tale due to the manor's ominous reputation. It was formerly the Blassenville's residence, a family from the West Indies who were known for their cruelty.
After the American Civil War, the Blassenvilles fell into poverty, with all their male members dead and only four sisters remaining, shortly to be joined by their Aunt Celia from the West Indies and her mulatto maid Joan. Celia mistreated Joan, and when the latter disappeared, it was thought she had run away. Soon after, Celia vanished as well, and it was thought that she had returned to the West Indies. Over the next months, three of the Blassenville sisters also vanished one by one. One night in 1890, the last of the Blassenvilles, Elizabeth, fled the house, claiming she had found her sisters' corpses inside a secret room and was attacked by something in the shape of a woman with a yellow face. Afterwards, Elizabeth left for California and never returned. The manor has lain deserted since, and the local black folk shun it. The eponymous pigeons sometimes flock about the decaying manor. Legend has it that they are the souls of past Blassenvilles' members.
The following evening, Buckner and Griswell visit the hut of an ancient voodoo practitioner, Jacob, seeking information about the house and the Blassenvilles. Jacob tells of the extinct family and of Celia Blassenville, who mistreated her mulatto maid Joan. He claims to be a creator of "zuvembies", although he insists he cannot talk about them to a white man without Damballah sending a snake with a white crescent moon on its head to kill him. Still, he drifts into senility before rambling about voodoo, the god Damballah, and zombies along with their female counterparts, zuvembies: who live only to kill, have no sense of time, possess hypnotic powers, and can live indefinitely unless wounded by either "steel or lead". Finally, he tells how "she" participated in voodoo rites and that "the other" came to Jacob for the "Black Brew", which transforms a woman into a zuvembie. Reaching for some firewood, Jacob is bitten by a venomous snake, meeting the fate he feared. Buckner and Griswell conclude that Joan transformed herself into a zuvembie, so she could exact her vengeance on Celia Blassenville and her nieces. They resolve on spending the night in Blassenville Manor to learn the truth. There, they find Elizabeth Blassenville's diary, which tells of her fear that something is in the house with her, has killed her sisters, and will kill her too.
That night, while lying awake in complete darkness, Griswell hears the same whistling as the previous night, which Elizabeth's diary had also mentioned. Thinking he is fleeing the house, Griswell finds himself climbing the manor stairs against his own will. He is confronted by a female apparition with a yellow face and welding a knife. Griswell is powerless to resist, but Bruckner, who has followed him up the stairs, shoots the creature, which flees, mortally wounded. They track its dying noises into the secret room, where they discover the hanging bodies of the three missing Blassenville sisters as well as the corpse of the zuvembie, which is still dressed in a ball gown.
Suddenly, Bruckner recognizes the face of the zuvembie from a portrait he has seen. It's none other than Celia Blassenville. The maid Joan, in revenge, gave the Black Brew she received from Jacob to her mistress and fled. Celia Blassenville, transformed into a zuvembie, killed three of her nieces and had been living in the abandoned manor, killing anyone who entered it at night.
Bruckner says that the case can be closed by saying that a madwoman had killed Griswell's friend John Branner, since nobody will believe the truth of the matter.
