In Babel No More, Michael Erard, “a monolingual with benefits,” sets out on a quest to meet language superlearners and make sense of their mental powers. On the way he uncovers the secrets of historical figures like the nineteenth-century Italian cardinal Joseph Mezzofanti, who was said to speak seventy-two languages, as well as those of living language-superlearners such as Alexander Arguelles, a modern-day polyglot who knows dozens of languages and shows Erard the tricks of the trade to give him a dark glimpse into the life of obsessive language acquisition.