In a perverse celebration of Hitler's birthday, two heavily armed students stormed through a Colorado school on April 20, 1999, killing as many people as they could. Confronting 17-year-old Cassie Bernall, they put a gun to her head and asked: "Do you believe in God?" She said "Yes". The killer laughed and pulled the trigger. Around the world, people hailed Cassie as a modern martyr, but a far more remarkable story has been left untold. Three years earlier, Cassie herself planned to murder a teacher and threatened suicide. In "She Said Yes", Cassie's mother breaks her silence to recount the dramatic transformation that led up to her daughter's final heroic stand.