Annaleigh Thaumas lives at Highmoor, an isolated manor by the sea, where four of her twelve sisters have already died under increasingly suspicious circumstances. When ghostly visions begin plaguing her and she discovers the girls have been sneaking out each night to attend glittering balls, she is drawn into a race to unravel the darkness before it claims her next. The series is rooted in the fairytale of the Twelve Dancing Princesses, reimagined as Gothic horror-fantasy with gods, ghosts, and ancient curses.

Annaleigh Thaumas is a curious and stubborn young woman who refuses to accept the official explanations for her sisters' deaths even when doing so puts her at odds with her father and stepmother. Verity Thaumas, the protagonist of the second book, is artistic, spirited, and carrying a secret she does not know she has—one that makes her unreliable narrator more compelling once revealed. Both sisters share a fierce love for family and an unwillingness to look away from what frightens them.

Across two novels—one following Annaleigh and a second following her younger sister Verity—the Sisters of the Salt series explores different Gothic horror registers within the same richly imagined coastal world of Arcannia. The first book is a taut mystery wrapped in fog and sea air; the second shifts to a lush botanical estate where Verity confronts the unsettling truth about her own perception of reality. Both stories ask what it costs to see clearly in a world determined to obscure the truth.