Mr. Avery is a science teacher at Bayview High who is repulsed by social media and technology. At the start of the novel, Simon, Addy, Cooper, Nate, and Bronwyn are all held for detention in his classroom after having been discovered with cell phones in their bags during his lab—though Addy, Cooper, Nate, and Bronwyn all insist the phones were planted in their bags, Avery’s revulsion is so intense that he will not even listen to their pleas. After Simon’s death, Avery mostly avoids being singled out as a suspect—though the intensity of his open hatred of social media, technology, and his students’ “screens” makes the Bayview Four themselves question whether Avery could have resorted to drastic measures to make his unorthodox perspective heard in an increasingly tech-obsessed world.