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Heidegger’s lecture course on « Parmenides » (1942/43) lays strong emphasis on the dimension of lethe in truth (aletheia). Such a withdrawal belonging to unconcealment should not be confused with a dissembling or hiding (pseudos). A concealment pertaining to the presence of a thing can be illustrated by means of a phenomenological description of oblivion, anamnesis, the rare, the gift and the secret. Especially Heidegger’s account of an « open secret » lends itself to a philosophical interpretation of Poe’s « The Purloined Letter ». Dupin recurrently meditates on the right way of keeping a secret and mocks the police for confusing lethe with pseudos. Incidentally, stealing is shown to be no less a form of unconcealment than the gift. Poe’s description of how and where the purloined letter is openly present in the minister’s study sheds light on how a thing can remain secret by giving way to other things.