Each one-hour episode introduces a different crime, as Arntfield - a working cop and university professor with a PhD - and his team use fresh eyes and advanced tools in their quest to solve these longstanding mysteries and bring closure to the victims' families. Arntfield guides the six-member squad as they take to the field, seeking new leads and exploiting modern technology, discovering evidence that may help close the case. Capitalizing on the potential of 21st-century technology to unearth new information, Arntfield also relies on squad members to use their own skill sets - which run the gamut from medical biophysics to forensic anthropology to private investigating - and ways of thinking to move each case forward. To Catch a Killer takes viewers along on its mission, as the team interviews family members and witnesses, dissects evidence (old and new), visits long-forgotten crime scenes, and re-enacts potential scenarios ... as the cold-case clock ticks. How far will the team go ...