If you read only three novelists on Mexico — and you should read many more, but that’s your affair — choose Juan Rulfo, Roberto Bolaño and Daniel Sada. Rulfo cleared the way for magic realism with Pedro Páramo, published in 1955, a decade before the Boom. Bolaño, a Chilean whose great subject was Mexico, asserted that realism itself was magic enough to support a novel, and his gangs of visceral realists and killers bore him out. Meanwhile Sada, who died last year, reveled in wordplay and mimicry in his Joycean celebrations of Mexico’s cowboy north.