These Level Z titles demand the highest critical reading skills from the most widely-read students. The books in this list will encourage students to explore controversial social and political issues and will spark discussion on some of the most tragic periods in our history. From mental health issues like PTSD, depression, and dementia, to homelessness, incarceration, and the hardships faced by immigrants and the LGBT community, this collection will challenge students to think deeply about the divergent experiences of people from all walks of life.