"The Grapes of Wrath" by John Steinbeck is a good book as it tackles the the hardships of the Great Depression. I found the book "Saint Maybe" by Anne Tyler an excellent read as it touches on the theme of searching for meaning in life amidst tragedy.
Another wonderful read, in the contemporary spy genre, is "The Russia House" by John le Carre. It touches on the universal themes of confrontations between countries, ideologies, and geopolitical systems.
"The Road" by Cormac McCarthy is a tale of warning of what can happen when society breaks down. It is a story that a young teenager may find enlightening and thought provoking. It will help them formulate their opinions on the path humankind is taking.
Finally, I suggest "Fahrenheit 451" by the recently deceased writer Ray Bradbury. This novel is a tale of the need to save books and literature, and a call to promote reading and thinking beyond Tweets and Facebook posts. A great warning novel, written well before the march to lost 'attention spans'.