Somewhere right now, a teenager is lying on their bedroom floor, staring at the ceiling, absolutely wrecked by a novel about kids with cancer. Somewhere else, a 30-something year old is faintly smiling, reading a dog-eared paperback about a road trip to Agloe, New York, a town that, delightfully, doesn’t actually exist. This is the John Green effect. It has been happening for two decades, and on August 24, it happens with a candle on top.