When a mother left her Surrey, B.C. condo for work in the morning, she never imagined that it would be the last time she would ever see her son. She returned to a building that was surrounded by yellow police tape, and it wasn’t long before word leaked out that six men had been slaughtered inside. As Jules Knox reports, a well-placed surveillance team led officers to the suspects behind the largest gang-related mass murder in the province’s history, but several unexpected twists in this case soon jeopardized the search for justice.

The show’s own verdict is on its page.