Gabriel Marcel (1889-1973) stands outside the traditional canon of twentieth-century French philosophers. Where he is not simply forgotten or overlooked, he is dismissed as a 'relentlessly unsystematic' thinker, or, following Jean-Paul Sartre's lead, labelled a 'Christian existentialist' - a label that avoids consideration of Marcel's work on its own terms. How is one to appreciate Marcel's contribution, especially when his oeuvre appears to be at...