Dark Towers offers a compelling, if familiar, thesis: that unchecked ambition twisted a pillar of German finance into a reckless casino and fostered a culture in which amorality and, ultimately, criminality thrived. Deutsche is intriguing not only because its leaders chased growth at any cost—resulting in mountains of losses, as it always does—but because it once was the emblem of European institutional lending, the near-opposite of Wall Street short-termism.