The Falling Woman — Pat Murphy

Elizabeth Waters, an archeologist who abandoned her husband and daughter years ago to pursue her career, can see the shadows of the past. It's a gift she keeps secret from her colleagues and students, one that often leads her to incredible archeological discoveries and the realization that she might be going mad. Then on a dig in the Yucatan, the shadow of a Mayan priestess speaks to her. Suddenly Elizabeth's daughter Diane arrives, hoping to reconnect with her mother. As mother, daughter and priestess fall into the mysterious world of Mayan magic, it is clear one will be asked to make the ultimate sacrifice. The book won the 1988 Nebula Award.