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Photo by: Kiyash Monsef

This February 2011 photo provided by the New York Public Library shows a letter opener belonging to Charles Dickens, which is housed at the library. Dickens had it made with a paw of his beloved cat "Bob" as the handle. The letter opener will be an object in a treasure hunt at the landmark building when 500 people will spend the night in the Library exploring its miles of rare treasures. Would-be players will be able to register online to play "Find the Future: The Game" on May 20, starting at 8 p.m. and ending at 6 a.m. the following morning. (AP Photo/New York Public Library, Kiyash Monsef)

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