The landscape after

After getting coordinates from Dad, Sam and Dean head north to Oregon to find a house that's making people sick for no apparent reason. Dean's antsy because of his unfinished business in that town with a violent spirit from four years ago, a machete-wielding murderer that simply vanished. But what he doesn't expect is the return of his feelings of obsession from four years ago - not over the case, but over Sam, who was away at college that summer. Dean tries not to get too worked up over all of it, but Sam's always been too hard to ignore.