It was a shocking true crime that left two families shattered, and became the coldest case in U.S. history. Who really killed little Maria? The question fueled a real-life nightmare in Sycamore, Illinois in 1957. Christmas was three weeks away, and seven-year-old Maria Ridulph went out to play. Soon after, a figure emerged out of the falling snow. He was very friendly. Minutes later, Maria vanished, leaving behind an abandoned doll and footsteps in the snow. In April, a spring thaw gave up Maria's body in a nearby wooded area. The case attracted national attention. In all, seventy-four men and three women fell under suspicion. But no one was ever charged with the crime. Incredibly, fifty-five years later, the coldest case in the history of American jurisprudence would be reopened.