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.

In 1995, a 92-year-old woman had been brutally beaten during a home invasion, managed to escape, but died months later. At the time, no one knew who'd so viciously attacked Henrietta Knight. But 20 years later as police are investigating the disappearance of a known criminal, they find a connection. As the investigation unfolds, they find links to a bank robbery, a car bombing and multiple murders. A trail of blood that leads them to the one man responsible for it all.