“Few writers are more acclaimed right now than the Chilean novelist Roberto Bolaño, who died of an unspecified liver ailment in 2003, at the age of 50. … [I]nterest in him and his work has been further kindled by his growing reputation as a hard-living literary outlaw.” But his widow and some of his friends say he invented elements of that biography: not only a heroin habit but his presence in Chile “during the military coup that brought Gen. Augusto Pinochet to power.”