The Netherlands, 1887. Lucy's twin sister Sarah is unwell. She refuses to eat, mumbles nonsensically, and is increasingly obsessed with a centuries-old corpse recently discovered on her husband's grand estate.

When a dark spirit reveals itself to Venus McKenzie, one of Saint-Ferdinand's teenage residents, she learns that this creature's power has a long history with her town-and that the serial murders merely scratch the surface of a past burdened by evil secrets.