November 1918: Nineteen-year-old James Sinclair is shot down over France. He would never forget the Great War and his near-death experience. Wealth and social status no longer seemed to matter. He wanted to be a hero. He made a vow to God and wrote about it in his journal. October 1956: Ten-year-old Elle Hancock finds her Daddy's body caught in their corn reaper. She lost the only hero she had ever known. If she had been a nurse, she could have saved his life. She was poor and felt alone. She made a vow to God and wrote about it in her diaries. September 1964: Elle is a freshman nursing student. Dr. Sinclair is now in his final year as a philosophy professor; his wife has cancer and he needs a student nurse. Through his integrity and strength of character, he inspires Elle to have faith in her journey. When destiny threatens their lives, they make a vow to God. May 2018: Bonnye Sinclair is twenty-one when she uncovers the secret that's been hidden for fifty years. As she pours over her grandma's diaries and the journal, she learns about sacrifice, heroes, and angels. She learns about faith. She learns about her real grandpa, and she learns about true love. This is their story.