Mythical ghost

Since the 1990s, the mystery of Cardenio, one of the lost Shakespearean plays, has attracted novelists who have transformed it into detective stories, theatre directors who have staged a play that no longer exists and editors, with the inclusion of Cardenio in the canonical catalogue of the Arden Series. The fever is still there, with new productions, new fictions or scholarly collections. How can we understand such a lasting fascination for this textual ghost?