I am Zach Cregger, writer, and director of “Weapons.” So at this point in the movie, Justine Gandy, who’s the teacher who presides over the class that went missing — She’s by the way, played by the brilliant Julia Garner — She has become so frustrated with the lack of action and satisfaction from the authorities that she’s decided to take it upon herself to get some clarity on this mystery. And the only lead that she has is the little boy who didn’t go missing, “Hello?” which...