For a few years at the turn of the 19th century, Jena, a small university town in the Duchy of Saxe-Weimar, was an intellectual Shangri-La. And then, suddenly, it wasn’t. Though its population was barely 4,500, Jena was for a while home to many of the leading German thinkers of the time—Caroline Böhmer-Schlegel-Schelling, Johann Gottlieb Fichte, Georg Wilhelm Friedrich Hegel, Wilhelm von Humboldt, Novalis, Friedrich Schelling, Friedrich Schiller, August Wilhelm Schlegel, Friedrich Schlegel, and Ludwig Tieck. Johann Wolfgang von Goethe, who lived 14 miles away in Weimar, was a frequent visitor and collaborator.
Andrea Wulf, born in India and raised in Germany, impulsively moved to England in her late teens and adopted the English language as her professional medium. She finds kindred spirits in the proudly independent, unconventional prodigies of…