Georgina asks permission from her old aunt, Patricia Mercer Vanderpyl, to marry Capt. Nugent before his departure for France. Patricia refuses and, in reply to Georgina's questioning, gives her a diary from her own girlhood to read. The diary unfolds the story of Patricia's marriage to soldier Anthony Vanderpyl. Returning on furlough after the outbreak of the Civil War, Anthony suddenly leaves Patricia to visit Mrs. Le Roy, an old flame, and is killed by her jealous husband. Positive that Anthony had been unfaithful to her, Patricia refuses to open the letter that her husband sent to her on the day of his death. Georgina now opens it and discovers that Anthony had gone to Mrs. Le Roy to end the affair that his brother Bentley was having with her. With this revelation, Patricia sanctions her niece's marriage and then dies, going to join Anthony in "the spreading dawn".