"Jackie" (Kate Dickie) has a job supervising an array of CCTV cameras monitoring the city overnight. It's pretty dull work watching the drunks go home, or keeping an eye out for the opportunistic criminals who share Glasgow's streets during the wee small hours with the foxes that scavenge the waste ground. One morning, she espies a couple in flagrante delicto up against the wall of the Jet garage and she thinks she…