Emily Nemen’s The Cactus League, as the title tells us, is set in the Arizona desert, around Scottsdale, during spring training for major league baseball. The novel is narrated by a sportscaster and while nominally the story of Jason Goodyear, the star outfielder for the fictional Los Angeles Lions, Goodyear’s story is interspersed with the stories of other richly drawn characters -- the batting coach, aging sports agent, the players, owners, ballpark staff and the hangers on.