Julia Garner stars in the horror film "Weapons," which arrived in theaters Friday. Her credits also include horror movies such as "Wolf Man" and "Apartment 7A."

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.