Unsolved

Hope Ann Moore disappeared decades ago, leaving behind a husband who detectives think knows more than he's letting on. "Princess Blue" -- the woman with no name. Just bones remain. And a high school class ring. Someone misses her. Someone knows what happened. Then there's Audrey Lee Cook, murdered and dumped in the infamous "Texas Killing Fields."

Life in small town South Texas is simpler. Slower. Quieter. Awful things are not supposed to happen here, but they do. Daughters don't come home, couples are targeted, hardworking fathers are ambushed. Their cases are some of the more than 250,000 unsolved murders in this country and every year that number goes increases. Victims whose killers go uncaught. Families destroyed.

Surveillance is life today. Doorbell cameras, convenience store security tape, traffic light cameras. We know we're tracked. We're used to it and frankly, we expect it. Those cameras are supposed to make us feel safe and when unsafe things happen, that video can go viral. If surveillance video is the best evidence in a cold case, is there hope it can get solved?