Given the Enlightenment, the French Revolution, empiricism and the laïcité on which la République prides itself, one might be surprised that a non-Christian French philosopher of the 20^th century analyzes the supernatural from a philosophical perspective. Despite an education in the tradition of rationalism, Simone Weil (1909-43) does precisely that – unfalteringly and unapologetically. Her point is that the supernatural is not merely a religious topic, reserved to theologians, but a reality of universal importance for believers and non-believers alike, while being at the center of every authentic religion, whatever its particular creed. More than that, it has its own scientific laws, more certain and immutable than the laws of nature. The supernatural is so essential that she places it at the center of her reflections during her work for the Free French in London in 1942-43. To her, it is essential to philosophy. Yet, one might ask how something so elusive can become an object of philosophic enquiry. I intend to show that Weil’s attempt is convincing in this day and age, as well as her analysis of the supernatural’s features, its impact and its significance.