Nine years ago, five college students conceived a way to use atmospheric energy to predict mass acts of human violence. A tragic event ended the project, and team leaders Aiyana and Brian haven't spoken since. Overwhelmed with guilt, Brian has spent the years alone in his lab redeveloping the energy model. Aiyana, now a doctor, refuses to acknowledge his covert research—until the new model predicts a threat to their heartland town.
As the urgency rises with each new piece of data, the team reunites under a cloud of mutual contempt and buried affections. Every potential solution is fraught with consequences, and the teammates challenge each other's philosophies while they struggle to cope with their inner fears. The fate of the town may be out of their hands, but through the endeavor, they will discover the significance of laughter and the value of a purple cape.