The Black Act by Louise Bohmer

The Black Act is a lush, sensory tale of a pair of twins, Anna and Claire, who are the last of a cursed bloodline of wise women. Anna, hard at work as a scribe for their clan, begins having visions of the origins of the curse. Combining these with the knowledge of her elder, Rosalind, Anna must untangle the mystery of the curse in an attempt to prevent her twin, Claire, from falling into its embrace…

Full review at DarkScribe.