Book recommendations for 13-yo HS freshman (male)?

<p>Bought my S a kindle fire when they were on sale at Wal Mart. We let him use our credit card to buy books …and he just keeps reading and reading. Best investment ever … he literally has read about 50 books over the last year. And I would not call him a book worm. He likes the device, likes reading books, amazon recommends others and he just keeps going. Good Christmas gift idea.</p>