Seventh-grader Sierra Shepard has always been the perfect student, so when she sees that she accidentally brought her mother's lunch bag to school, including a paring knife, she immediately turns in the knife at the school office. Much to her surprise, her beloved principal places her in in-school suspension and sets a hearing for her expulsion, citing the school's ironclad no weapons policy. While there, Sierra spends time with Luke, a boy who's known as a troublemaker, and discovers that he's not the person she assumed he would be—and that the lines between good and bad aren't as clear as she once thought. Claudia Mills brings another compelling school story to life with Zero Tolerance.