I've always loved recommending short novels to students because they pack so much depth into a compact format. 'The Old Man and the Sea' by Hemingway is a classic—simple language but rich symbolism, perfect for analyzing themes like perseverance. Shirley Jackson's 'The Lottery' is another gem; its shocking twist sparks great classroom debates. For contemporary picks, 'Exhalation' by Ted Chiang offers sci-fi that makes you think.
Don’t overlook 'The Metamorphosis' by Kafka—it’s weird, unsettling, and unforgettable. Students often connect with Gregor’s alienation. I’d also toss in 'A Good Man Is Hard to Find' by Flannery O’Connor for its dark humor and moral complexity. PDFs of these are easy to find, and they’re short enough to read in one sitting but dense enough for deep discussion.