Speeding Bullet (Point Fiction) by Neil Shusterman - Vintage Paperback

After Nick Herrera saved a little girl from being his by a New York City subway car, things have been different.... He has been different. Now it seems as if accidents are falling at his feet and he's destined to play the role of the hero. But more importantly, Linda Lanko, one of the richest girls in the city, has noticed him -- a below-average student from a poor family. But is Nick's invincibility just good luck, or is something else responsible?