18-year-old Kyle Farishian is working the late shift at a 7-Eleven on Halloween when he is brutally attacked by a masked assailant. With no physical evidence, detectives scrutinize the convenience store's surveillance footage for any clues.

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.