 Ben realizes that the recent bat infestation has something to do with what was going on, and if he could find the bats' new roost, since they'd vacated the plastics factory, he might find the cause of the problem.They had previously caught a bat, which they kept in a birdcage, and Ben straps a small vehicle tracker to it and sets it free, hoping it will lead him to the roost.Ultimately, the bat leads Ben—as well as Brandy—to a disused grain silo in a deserted part of Stillwater.