On November 23, 2012, Pennsylvania DJ Ervin Holton is found shot dead on his friend's porch. With no witnesses, investigators spot cameras outside a nearby store. Pointing directly at the crime scene, could this camera have captured Ervin's killer?

In 2009, 25-year-old student Julissa Brisman is found shot and bound in an upmarket hotel room in Boston. With no witnesses to the crime, investigators turn to surveillance cameras in the surrounding area and quickly unravel a serial attacker.