Once a police detective in St. Paul, Minnesota, Rushmore McKenzie has become an unlikely millionaire and an occasional unlicensed private investigator, doing favours for friends. The favour, this time, is for a friend of a friend - Erin Peterson, a local businessperson and owner of a growing food company called Salsa Girl. Someone seems to have a beef with her: the outside locks on her factory having been systematically filed with superglue. But for some reason, Erin didn't want to report this harassment to the police. As a favour to his poker buddy and hockey teammate Ian, McKenzie agrees to stop by and chat with Erin.
At first Erin denies there's anything going on and then, when the harassment escalates and threatens her business, she also asks for McKenzie's help. The further McKenzie digs into the situation, the more complicated... and deadly... it becomes. And somewhere, in the middle of it all, is Erin, playing all sides against the middle, leading McKenzie to wonder if you ever really knows who your friends really are.