Thirty-six-year-old Carl Starke is shot dead in cold blood near his home in St. Augustine, Fla.; while there are no witnesses, neighbors hear shots; armed with a likely time of death, police turn to CCTV to help hunt down Starke's killer.

June 30, 2008. Tom and Jill Estes' bodies are found behind a dumpster in Festus, Missouri. Police are baffled, until a receipt leads to CCTV of a blood-stained suspect. A trail of bodies reveals a killer who must be stopped - before he strikes again.