On Celestra's Wings tells the story of the all-conquering power of love, even over the most difficult obstacles. Set in the Civil War, the story focuses on the Northerner Rance Redmond and the Southern belle Kathleen McClarnen and the circumstances that threaten to keep them apart. Rance must overcome intense difficulties to reach Kathleen. However, he is emboldened in his quest by Celestra, the angelic presence who has repeatedly appeared to comfort him.