A lockdown surprises 5 grade 12 students, and they all end up in the same washroom. Alice, is an introvert who is really good at writing, she also has the responsibility to take care of her autistic brother Noah. Isabelle is the popular girl that everyone wants to be friends with, who has a big ego and sometimes only cares about herself. Then there’s Hogan, who used to be a football player, but is now someone feared by many because of the rumors going around that he killed his brother, he may seem scary but in the inside, he just needs someone to understand. There’s also the last guy named Xander, he’s socially awkward and sometimes says things that shouldn’t be said out loud. He’s always snapping pictures of random moments with his camera he calls “The Tank”. After a while, Isabelle gets a text from her best friend Brianna that this lockdown is not a drill, and there’s an actual shooter roaming around in the school, and it also turns out that one of the people know more about this shooter than they realized, and together they try to figure out what the shooter is trying to do, and how to stop them.