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The case of the scientific aristocrat; the case of the missing energy; the case of the pre-atomic doctor; the case of the sabotaged scientist; the case of the flying bullets; three cases of relative jealousy; the case of the faster businessman; the case of the energetic anarchist; the case of the disloyal servant; the case of the deserted beach; the strange case of Mrs. Hudson's cat; the case of the lost worlds.