Every year, Major League Baseball spends more than $1.5 billion on pitchers five times the salary of all NFL quarterbacks combined. Pitchers are the lifeblood of the sport, the ones who win championships, but today they face an epidemic unlike any baseball has ever seen.

One tiny ligament in the elbow keeps snapping and sending teenagers and major leaguers alike to undergo surgery, an issue the baseball establishment ignored for decades. For three years, Jeff Passan, the lead baseball columnist for Yahoo Sports, has traveled the world to better understand the mechanics of the arm and its place in the sport s past, present, and future. He got the inside story of how the Chicago Cubs decided to spend $155 million on one pitcher. He sat down for a rare interview with Hall of Famer Sandy Koufax, whose career ended at 30 because of an arm injury. He went to Japan to understand how another baseball-obsessed nation deals with this crisis. And he followed two major league pitchers as they returned from Tommy John surgery, the revolutionary procedure named for the former All-Star who first underwent it more than 40 years ago.

Passan discovered a culture that struggles to prevent arm injuries and lacks the support for the changes necessary to do so. He explains that without a drastic shift in how baseball thinks about its talent, another generation of pitchers will fall prey to the same problem that vexes the current one.

Equal parts medical thriller and cautionary tale, The Arm is a searing exploration of baseball s most valuable commodity and the redemption that can be found in one fragile and mysterious limb.

This is the most important baseball book in years, not just for major league pitchers like me who had Tommy John surgery but for every parent who wants a child with a healthy arm. This is an epidemic that can be fixed, and The Arm is a great first step. John Smoltz

A timely and comprehensive look at all aspects of a baseball problem that in recent years appears to approach a crisis. Bob Costas

The Arm makes it official Jeff Passan is the best young baseball writer in America. This searing, meticulously reported account of the orthopedic revolution that began with Tommy John is must reading for every manager, general manager, pitcher, and, most especially, every parent whose child has 100-mph dreams. Jane Leavy

This is a stunning expose of the hidden story behind the most frequent operation performed on the most important players in this most important game in our country. Ken Burns"