When every mother's worst nightmare becomes Grace's reality, she must examine her entire life -- from the wrong choices to the right mistakes. Grace's son Jack is a miracle. At three years old, he's fighting a mysterious, deadly disease that his doctors predicted would kill him as a baby. Even though it was determined to be mitochondrial disease, the little-known illness remains a mystery to medicine. Grace has sat by his bedside every minute he has been in the hospital, questioned every diagnosis, every medicine -- even poring over medical journals and books at home late into the night. To the world, Grace's fierce dedication is the sole reason for her son's survival. But someone suspects that perhaps Jack's disease is not what it seems.