Film scene: a wood-panelled library of some elegance on the Canadian-American border. So precisely on the border, in fact, that a line of black duct tape running across the polished marble floor divides the building between Quebec and Vermont.
It was here, explains our soft-spoken narrator, that three men brought a backpack through the US entrance in 2011, depositing it in a lavatory to be collected by a criminal who then left through the Canadian exit. The bag was full of smuggled guns.
