In the third segment of this recurring series, Ben, Matt and Noel return to the grisly world of true crime, killers who not only committed multiple murders but were never caught and, in some cases, may well be alive and free today. Several of these murderers may be people you've never heard of, while others may be infamous. One thing's for sure, however: Many of these cases remain open and unsolved, and you or someone you know may be the person who can finally provide a lead, solve the crime and finally put these monsters behind bars.