At age twelve, Marshall Tobias saw his best friend killed by a train. It was then that he began his search for faith-delving into one tradition, then discarding it for another. His parents, however, have little time for spiritual contemplation. Their focus has been on his little sister Megan, who suffers from severe food allergies. Now Marshall is home from college with his first real girlfriend, but there is more to Ada than meets the eye-including her beliefs about the evils of medical intervention. What follows is a crisis that tests not only faith, but the limits of family, forgiveness, and our need to believe.