No Name by Wilkie Collins

No new revelations came back with them: no anticipations associated with their return were realized. On the one forbidden subject of their errand in London, there was no moving either the master or the mistress of the house. Whatever their object might have been, they had to all appearance successfully accomplished it -- for they both returned in perfect possession of their everyday looks and manners. Mrs. Vanstone's spirits had subsided to their natural quiet level; Mr. Vanstone's imperturbable cheerfulness sat as easily and indolently on him as usual. This was the one noticeable result of their journey -- this, and no more. Had the household revolution run its course already? Was the secret thus far hidden impenetrably, hidden forever?

Nothing in this world is hidden forever. The gold which has lain for centuries unsuspected in the ground, reveals itself one day on the surface. Sand turns traitor, and betrays the footstep that has passed over it; water gives back to the telltale surface the body that has been drowned. Fire itself leaves the confession, in ashes, of the substance consumed in it. Hate breaks its prison-secrecy in the thoughts, through the doorway of the eyes; and Love finds the Judas who betrays it by a kiss. Look where we will, the inevitable law of revelation is one of the laws of nature: the lasting preservation of a secret is a miracle which the world has never yet seen.