What I Know: An utterly compelling psychological thriller full of suspense

I was thirteen the first time my brother tried to kill me. These days, Della is a loving wife, a dedicated teacher, a woman trying to do her best. She has put her past far behind her. But she hasn't forgotten the lessons she learned. It's just a regular morning when Della welcomes Zoey to her English class. She treats her like any other new student: assigns her a desk, hands out the work. But then she meets Zoey's cold, calculating eyes and freezes as terrifying memories threaten to overwhe...