Malcolm Lowry’s 1947 masterpiece “Under the Volcano,” about the fervid last hours of an alcoholic ex-diplomat in Mexico, is set to the drumbeat of coming internal and external conflict. Autobiographical and reflective of the expatriated trust-funder in a futile search for an artistic home, the perpetually inebriated master got lost along the road toward his own abyss, and died under suspicious circumstances, out-of-print.