Pamela's friends escorted her to the door of Moss Cottage and left her there. What explanation she gave to her mother they never knew. They feared there was great unpleasantness in store for the Reynolds, for Mr. Hockheimer was sure to be arrested, and the fact that it must be through his niece's instrumentality only seemed to make matters worse. David and Anthony returned with the news that they had roused Captain Harper at the Camp, and that after reading the message he had ridden off immediately upon his motor bicycle. They went to bed wondering what would be happening while they slept. The boys looked out for Pamela next morning on the road to the station, but she was not there. The train for once went without her. They spent an agitated day at school and hurried back from Netherton that afternoon at topmost speed. They found Captain Harper in the garden at Walden. He looked very grave. "Do you know what that message was you brought me?" he asked. "Translated into English it meant, 'U-boat in Channel to-night. Show light on Berry Head.' I hear a certain important vessel had an extremely narrow escape last night. The wireless apparatus at Moss Cottage has been taken down already. The police went up there this morning." "And Mr. Hockheimer?" Captain Harper knocked the end off his cigarette before he answered. "Mr. Hockheimer has gone to settle his great account. He and his car were found in the river at Chadwick this morning. The road turns at a very sharp angle there on to the bridge, and it is thought that in the darkness he missed his way and went over the bank. There is not a shadow of doubt that he was going to give signals to the enemy. We had long suspected him as a spy, and part of my business down here had been to watch him. In the circumstances this has been the most merciful thing that could have happened. For the sake of the Reynolds we are hushing the matter up. There is no need for it to be bruited about the neighbourhood. Your family are the only people who have any knowledge of the affair. I can trust you to keep it from going further." "On our honour!" the boys assured him.