In 1932, Elisabeth Congdon, an unmarried heiress to a mining fortune, adopts a baby girl named Marjorie. Marjorie grows up in the Glensheen mansion in Duluth, Minnesota, given everything she could ever need or want. Forty-five years later, Elisabeth is found smothered in her bed at Glensheen. Her night nurse has been bludgeoned to death. Evidence points to Marjorie and her husband, Roger Caldwell. This is the inside story of Marjorie Congdon and the stream of mysterious arsons and murders following in her wake.