15-year-old Sierra LaMar leaves for school like any other day, only to disappear without a trace. Is this just another typical runaway or did something a lot worse happen to Sierra? Surveillance footage helps reveal the truth.

When Marcel Reardon is discovered bludgeoned to death outside a building, his friends deny all knowledge of his murder. But detectives are convinced at least one of them is lying. As the net closes, the prime suspect prepares to strike again.