In an inspired Major League pairing, all-star pitcher Gibson, 73, talks mechanics, psychology and culture with 63-year-old Reggie Jackson, one of the game's greatest hitters. Although they never faced each other on the field, they square off on everything from pitch counts and swing styles to catchers, managers and umpires, to clubhouse environments and media distractions. In lengthy discussions steered by author Wheeler (Gibson's autobiography collaborator), the two often turn conversational, sharing stories about Willie Mays, Hank Aaron, Frank Robinson, Alex Rodriguez and Albert Pujols, among others, but the book reads best when the duo discusses controversies: spitballers, hit batters, steroids, free agency and racism. Their egos and memories remain remarkably vivid; Gibson, who spent 17 years on the mound for the St. Louis Cardinals, constantly cites his own stats, and Jackson, who won the World Series with both the A's and the Yankees, takes credit for Derek Jeter's success. Fans will come away from this discussion between greats with even greater understanding and appreciation for the game.