The Gloaming by Kirsty Logan

On a remote Scottish island where the elderly literally turn to stone, Mara Ross lives in the shadow of a devastating family tragedy. Her world is defined by grief, isolation, and the heavy pull of local folklore until the arrival of Pearl, a mesmerizing and confident traveling mermaid performer. As the two young women are drawn together into a passionate romance, Pearl's presence ignites a spark in Mara, challenging her to look beyond the island’s dark magic and imagine a different future for herself.