In Silver Springs, Arizona, her mother's stories of the monstrous La Llorona are thrilling but unbelievable to science-loving Paola until she and her best friends Dante and Emma take a walk through a cactus field near the Gila River.

Alejandra no longer knows who she is. To her husband, she is a wife, and to her children, a mother. To her own adoptive mother, she is a daughter. But they cannot see who Alejandra has become: a woman struggling with a darkness that threatens to consume her. Nor can they see what Alejandra sees. In times of despair, a ghostly vision appears to her, the apparition of a crying woman in a ragged white gown. When Alejandra visits a therapist, she begins...