How could this have happened? Ann Fletcher returns home to Charleston, SC to see her younger sister Sarah receive her master's degree . . . only to find herself in the back of an ambulance, watching helplessly as Sarah fights for life. As they race to the hospital, Sarah talks to someone who is not there—and hums a song Ann has never heard before. She'll hear that tune again, always when she least expects it. As Ann walks through the dark days after the accident, God begins to reveal Himself to her: through new friends, old heartaches, and that oddly healing melody. Could it be an Angel Song?