The Mystery of the Vanishing Treasure — Robert Arthur

Missing: One fabulous, jewel-encrusted belt, once owned by the ancient emperors of Japan. The Three Investigators are ready to jump into action, but officials at the Peterson Museum turn them away for being too young. Then a strange twist of fate brings Jupe, Pete, and Bob on the case, and the boys are soon surrounded by master criminals--who will stop at nothing to hold on to their stolen fortune! Is the priceless belt lost for good, or will the Three Investigators be able to save the day?