The children do not hand the German over to the authorities, but keep him prisoner at their fort. The children bribe the German with the offer of a boat if he will repair their machine gun. He agrees and mends it before being taken to the dock where he rows off. The same night the church bells ring signalling a German invasion. The children hurry to the fortress but do not see anything; it was a false alarm. Out at sea, Rudi finds he does not have the strength to row to German-occupied Norway and is forced back to England and rejoins the children at the fortress.