The Rule of Three Chapter Questions and Answer Key / Teacher Notes. My students loved this novel! "The Rule of Three" by Eric Walters explores the consequences of a global catastrophe that disrupts modern technology, leaving people to survive in a world without electricity. Phones and most cars stop working and the main character, Adam, is left to navigate his new situation. This is appropriate for grades 7-8 or grades 9-12 at the locally developed/workplace/essential level. ENG1L, ENG2L, ENG3E