A lonely young man starts to display disturbing behaviors that point toward violence.
Miles Mantis is in therapy. He wants to talk about his anxiety. He wants to talk about his control issues, and his dysfunctional family. What he doesn't share with his therapist are the details of his violent imagination, or the "Manifesto" list he's been making..
Killer Mantis is a darkly comedic character study about anxiety, fear and violence in America.