When Amy Lord is discovered stabbed to death, police trace her movements by using footage from five different ATMs in Boston.
Kenia Monge disappears without a trace and detectives then find out about some chilling surveillance footage, revealing exactly what happened to her.
After Mickey Shunick goes missing her family mobilizes the local community to help look for her. The police then see her on a surveillance video.
Michelle Le vanishes without a trace and police find footage that shows her car circling the parking lot where she vanished.
After a college student called Dru Sjodin disappears following her shift at Victoria's Secret, investigators look at surveillance camera footage to find out the shocking reason for her disappearance.
Christian Aguilar vanishes from campus in Florida, leaving his family and friends in turmoil. Closed-circuit television recording sees the case going in a shocking new direction.
Surya Toha disappears in Coral Springs without a trace after dropping her sons off at school. Some shocking video surveillance footage then reveals exactly what happened to her.
Elizabeth Ennen disappears after a family friend drops her off at home, but her mother says she never came through the door.
Some grainy security footage reveals what happened to college student Katie Poirier who vanished whilst working the late shift at a gas station.
Keith Reed is shot on his doorstep and surveillance footage helps the police to unravel the mystery of who killed him and the reasons why.
Rick Chance is gunned down in a hotel room causing detectives to look at a surveillance video to try and catch his killer.