The Third Key


      The second Earl of Duke summoned me up to his vast estate.  He had read about me in the papers and assumed, correctly I must say, that I was the only one – virtual or real – who could help him out with this little mystery.
       It seemed that the first Earl, his father, just died and left him the lavish Brigston Manor.  Earl Jr. had not been there since his childhood.  While exploring his new domain, he came upon a gorgeous grand piano and sat down to plunk out a tune.  That’s when noticed a locked door hidden behind some curtains.
       The servants said that the previous Earl kept his priceless violin collection there.  Pressed for cash to keep up the manor, the new Earl was anxious to get into that room.  But none of the servants knew how to open the door.  All they knew was that his father had installed a sophisticated lock on the door and said, on his deathbed, that the third key would open it.  But there were dozens of keys for rooms in the manor and none of them opened the lock.  So where exactly was the third key?
       It seemed quite hopeless.  To the Earl, that is.  Naturally I thought about the problem for a moment and was able to open the locked door fairly easily.
       What did I suggest?


Nano Solution_____________________________________________

       “Um...uh...you...”
       But your stammering is obviously getting on Nano’s nerves and almost causing a flicker in the hologram.
       “I suggested that it wasn’t a mechanical key at all that the old man had referred to.  It was a musical one because the lock was acoustic.  It worked on sounds.  The third key referred to the third key of the piano keyboard.  I instructed him to play it and the lock opened instantly.”

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