THE disappearance of Monsieur and Madame Perrier was known to the Paris Surete within forty-five minutes of its happening. But that brief period of time might just as well have amounted to as many hours for all the clue there was to the authors of the outrage. Monsieur Perrier is, or was, as all the world knows, the great French chocolate "king," and a franc multi-millionaire many times over.