Read this excerpt from The Dark Game by Paul B. Janeczko. Select the detail that best supports the inference that an element of luck enabled Room 40 's code breakers to read German communications. The director of Room 40, Admiral Sir William Reginald Hall, was constantly on the lookout for any German codebook he could get his hands on. In December an iron-encased sea chest was delivered to his office. The chest had been hauled to the surface in the net of a British fishing trawler. It turned out that the chest was from a German destroyer that had been cornered and sunk by British warships. Among the personal papers and nautical charts in the chest, Hall discovered a codebook. It took the code breakers of Room 40 a few months to discover that the book contained the code system used by the German military to communicate with their naval attachés abroad.