In December of 2000, an unknown assailant brutally murdered the Miyazawa family as they slept in their home, preparing to celebrate the new year. This horrific crime only seems to grow more mysterious -- the killer stayed in the home after the murders, eating food, leaving evidence, and using the computer. Police have the killer's personal possessions. They have his DNA. And, more than two decades later, they have yet to find this murderer.