I have to admit that I'm a bit intimidated by everything your teens are reading! Because I'm simply thrilled that my 16yo ds, who seems allergic literature, is reading, and thoroughly enjoying, a graphic novel, Maus: A Survivor's Tale. It won the 1992 Pulitzer Prize, so it isn't fluff, but it is a graphic novel. It is the autobiographical story about the author, his father's experience in Auschwitz, and how it shaped their lives together. The Jews are mice, the Germans are cats, and the drawings provide a bit of a buffer from the horrors, though it is a brutally honest story.
My ds is discussing it, analyzing it --- he is totally engaged. And I'm thrilled!
I'm looking forward to enjoying more of the classics with my younger son, who loves literature. He is a huge fan of mythology and fantasy, though he also loves Sherlock Holmes and James Herriot!