Henry Rudolph Steiner, a young piano salesman, was a real adventurer. He had always dreamed of adventure.As he was walking down the street, his attention was caught by a black man handing out cards. The Negro thrust a card into Rudolph's hand. There was nothing on one side of the card, and on the other, "Green Door." And then Rudolph saw that three paces away a man had thrown away the card he had given him as he passed. Passing by it again, he received the card again. The same thing was written on the first card. There were three maps on the sidewalk. Whatever the words on the cards meant, the negro had chosen him twice from the crowd.