It was a crime unlike anything ever seen before in Canada. The horror of the 'Wells Gray Murders' forty years ago still haunts investigators involved in the case, as well as family and friends of the victims. In August 1982, David Shearing stalked and murdered three generations of a family while they were out on a summer camping trip in B.C. After a long cross-country investigation, police learn the killer was always closer than suspected. What was the murderer's motive for such a horrific crime?

Reporter Caryn Lieberman reveals how Larry Arnold's murder investigation is linked to the 1997 killing of a 20-year-old woman hundreds of kilometers away in North Bay, Ontario. Sarah Whitehead was sexually assaulted and murdered as she left a mall. Both murders were mysteries that almost went unsolved, two seemingly unrelated cases, until DNA from a cigarette butt led police to the killer. A serial rapist and murderer whose crimes crossed provincial borders and some of which likely remain unsolved to this day.