"Killing Mr. Griffin" is a young adult novel by Lois Duncan that tells the story of a group of high school students who plot to kidnap their strict English teacher, Mr. Griffin. The plan goes awry when their actions lead to unintended consequences, resulting in a tragic outcome. The novel explores themes of peer pressure, morality, and the impact of choices. As the students grapple with their guilt and the fallout from their actions, they must confront the reality of their decisions and the consequences that follow.