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Chapter 12 PUZZLES AND PLANSChief Fleck had spent a sleepless night trying to put two and two together. Instead of the answer being "four" as it should have been each time he completed his figuring the result was "zero." Time and again he mustered the facts into columns, only to succeed in puzzling himself the more. Two German spies, the Hoffs, had set out together in their motor on their usual mysterious Wednesday mission. Two other persons, two of his most intelligent operatives, Thomas Dean and Jane Strong, had set out on a motorcycle to shadow them. What had happened? Otto Hoff had returned to his apartment on foot, hours before his usual time, seemingly much perturbed about something. Frederic Hoff had arrived back at the apartment, also on foot, some hours later than us