AN IRON KEY with a paper tag attached.

Now Frederik guessed that the shoe had been lost by accident. Since he couldn’t understand his letters, he plunged downstairs to ask his mother to read the tag. It was an address. “An invitation?” wondered Frederik. “A nuisance,” said his mother, but he pestered her until she was overcome. She knew he couldn’t find an address on his own, so they made their way hand in hand across the causeway and through quiet streets to locate the address attached to the key.