On a sunny spring day, a man walked into an office in midtown Toronto and opened fire. There was panic at the neighbouring daycare and nearby schools, fearing a gunman was still on the loose. When police arrived, they discovered the shooter had killed two people, Arash Missaghi and Samira Yousefi, before turning the gun on himself. Initially officials did not release the motive for the attack, but his wife said her husband, 46-year-old Alan Kats, could not handle 'losing our life's savings' in an alleged mortgage fraud the two victims were accused of.

Australian Kevin McBride was known for being fun-loving and outgoing, the life of the party. So, when the 47-year-old window dresser and antiques dealer is found stabbed to death in his Toronto apartment no one can believe it. As police track suspects across Canada and the US, the victim's diary is found 400 km away. It's missing the page from the day he was murdered, but it provides a name. The problem for investigators – that name belongs to someone who can't be found.