The Leader centers on the life of German thinker Karl Marx, focusing on his political and economic theories, his romance with Jenny von Westphalen, and his friendship with Friedrich Engels.The Leader centers on the life of German thinker Karl Marx, focusing on his political and economic theories, his romance with Jenny von Westphalen, and his friendship with Friedrich Engels.The Leader centers on the life of German thinker Karl Marx, focusing on his political and economic theories, his romance with Jenny von Westphalen, and his friendship with Friedrich Engels.