As the daughter of Princess Celestia, Princess Summer has always been held to a high standard. As a young war widow, however, she struggles to get through each day. As she watches her younger cousin embrace life with a husband and newborn daughter, she is constantly reminded of the life that was so tragically stolen from her. Her late husband’s killers broke a sacred rule: Never hurt anypony who is loved by an alicorn. The daughter of the sun is out for revenge.