In the fifth adventure in Robert Arthur's classic mystery series, Jupiter, Pete, and Bob are in hot pursuit of a magnificent belt, studded with jewels, that once belonged to an ancient line of Japanese emperors. When it is stolen from under their noses at the Peterson Museum, the Three Investigators are determined to find it - partly to help Taro Togati, a Japanese boy whose father will be disgraced if they don't. Soon they're tangling with garden gnomes, ruffians, and a gang of ruthless criminals!