their sharp points provide grip on ice that is otherwise often too slippery for a person to pull themselves to safety. there have been two additional books under the series: the black belt club #2: nightmare on the mountain of fear (2006); and the black belt club #3: beware of the haunted eye (2007). the town is on the right side of the po river. another innovation in this period was the use of motorcycle messengers to speed up delivery. another sergeant suggested that the quickest way to the front lines would be to seek a position driving ambulances. 