When Kyle Shanahan became the NFL's youngest offensive coordinator in 2008, he had one prevailing rule: Tell me the why. If a colleague couldn't justify his position by providing the unassailable reasoning behind it, he was told to get the hell out of Shanahan's office. Shanahan and the members of his coaching tree—including Sean McVay, Mike McDaniel, Raheem Morris, and Matt LaFleur—came up in a sport where innovation was the exception, not the rule. There had been brilliant football minds before, from Paul Brown to Bill Walsh to Bill Belichick. But for the most part, coaches learned a particular system and stuck to it no matter what—no matter the players on their team, no matter what the opponent might do.

This group of young coaches would change all that. The Why Is Everything is the story of old dogmas falling before astonishingly creative new strategies and game plans. Drawing on unmatched access across the league, longtime NFL reporter Mike Silver takes us into the key moments in this still-unfolding revolution. Less than a decade after their emergence, these men are the stars of their profession and have helped propel the NFL to new heights of viewership and drama. With The Why Is Everything, Silver reveals how it all happened, and in the process gives us a timeless account of friendship, rivalry, and the never-ending pursuit of perfection.