On a summer day, a young woman alighted from a bus in the small Cape Cod village of Chatham and took up residence in a cottage on the edge of Black Pond's dark waters. She was embarking on a voyage she could not foresee --- one that would bring catastrophe to her, to those she loved, and to the town of Chatham itself. Now, seven decades later, only one living soul knows the answer to the question that irrevocably shattered hearts, a town, and a way of life: What really happened on Black Pond that day?