A thirty-year old case. A body discovered in the snow. For one grieving detective, it's going to be a long, cold winter. After the passing of his wife, Major Crimes Detective Dallas Nash is handed a cold case to ease him back into the job. Three decades prior, a teenaged girl was strangled to death. Upon examining her file, Nash makes a startling revelation—as a teenager, he saw the girl shortly before that fateful day. Soon, Nash is dispatched to a separate wintery crime scene. Amid a heavy snow fall, there are no witnesses and no suspects to the murder. As the temperature remains freezing under a heavy gray sky, can Dallas Nash find two killers—one of which has remained hidden for thirty years?