John Green has been very busy lately to sit down and work some paperback magic, here's why. As John Green fans may have noticed, the cult-favorite novelist hasn't published a book since he penned Hazel and Augustus' cancer-laden, infinity-embracing love story in "The Fault in Our Stars," which spawned a blockbuster movie featuring "Divergent" stars Shailene Woodley and Ansel Elgort.