Since I see discussion of high school English classes, I'll toss out a situation and ask for recommendations.
Situation: HS Freshman "Honors Literature and Writers' Workshop" (top-end honors Freshman honors English class, only 28 kids out of a class size of about 575). Student (14-year-old boy) is a voracious reader, mostly history (fiction and non-fiction), some SF (mostly Star Wars and Star Trek novels, although I've gotten him to read the Naomi Novik Temeraire series and Little Brother), some military fiction (e.g. WEB Griffin), and a range of YA (the usual suspects like Harry Potter and Lemony Snicket, Muchamore, Paolini, Applegate, the Higson Young James Bond series...).
Assignment is to read and report on an adult-level novel by a non-American author that "couldn't be made into a movie".
Digging through my collection, the best that came to mind were either Singularity Sky (Stross) or one of the Discworld books. Singularity Sky might be a bit deep -- Glasshouse might be a better Stross, or the first of the Family Trade books might appeal to him.
Any other suggestions?
It's a poor sort of memory that only works backwards.