The gangsters/gun-runners who own the ammunition dump arrive and block the road in front of Chitty-Chitty-Bang-Bang. The gangsters threaten the family, but Commander Pott throws the switch which transforms the car into an aeroplane and they take off, leaving the gangsters in helpless fury. The Potts stay overnight in a hotel in Calais. While the family sleeps, the gangsters break into the children's room and kidnap them and drive off towards Paris. Chitty tracks the gangsters' route, wakes Commander and Mrs. Pott, and they drive off in pursuit.