In September 2014, an Iowa college town panics after police find Tong Shao, a missing student from China, murdered; when security camera footage points to a planned execution, hunting down the young woman's killer becomes an international mystery.

Detectives rely on surveillance footage at a hospital in Tyler, Texas, when patients mysteriously start dying in the intensive care unit.

In North Carolina, Stephanie Powell-Anderson's convenience store shift ends in bloodshed, as part of a larger pattern of violence plaguing the area; with the assailant growing bolder by the day, the heat is on to make an arrest before he kills again.

In Texas, on Christmas Eve 2010, a woman gets a mysterious phone call at work and speeds home to find her 12-year-old son gone without a trace; investigators look at those closest to the boy, but only surveillance footage can lead them to the truth.

In the summer of 1994, a night out in Miami turns deadly for two young women and a popular nightclub owner; with little evidence found on the scene, investigators must rely on a hidden home video camera to help solve this mystery.

In 2018, 59-year-old Pamela Hutchinson is found dead in her Florida condo; the search for answers leads police to a mysterious woman spotted on CCTV; when the suspect is linked to yet another murder, it sparks a nationwide manhunt and media frenzy.

In Groton, Vermont, a young man with a developmental disability leaves work and is never seen again; with no leads in sight, investigators must rely on surveillance footage to piece together the truth behind Christopher Gray's disappearance.

In 2009 in Tracy, Calif., a little girl vanishes after playing at a friend's house, leaving her family desperate for answers; with no leads and few clues, investigators must rely on surveillance footage to piece together the horrifying truth.

When a killer executes 19-year-old Abigail Gasca-Chavez in her own home, the only witnesses are her toddler and neighbourhood surveillance cameras; detectives close in on a suspect, but when he heads for the Mexican border, it's a race against time.

In Dalton, Georgia, someone stabs convenience store clerk Dahyabhai Kalidas Chaudhari to death at his job. Police turn to security footage for answers and discover a surprise revelation about the killer's identity that blows the case wide open.