This 8th book in the “Outdoor Girls” series, find the girls and boys again at Pine Island, but under very much altered conditions. America had entered the great World War and all the boys but Will Ford have volunteered. Later the boys were called to Camp Liberty, some distance from Deepdale, and the girls conceived the plan of opening a Hostess House for the benefit of the relatives and friends of the boys. While still at Pine Island the girls and boys had come upon a suspicious looking man in the woods Upon finding himself discovered the man had made his escape but in his hurry had dropped a letter which the girls found to their disgust was written in code They decided that the man must have been a German spy. (Adapted from the next book in the series)     [chương_files]  

In this 11th book in the “Outdoor Girls” series, the girls have some very exciting experiences. An old man, Professor Dempsey, by name, who had retired to a little log cabin in the woods to recover his health, had chanced to do the girls a very great favor. Of course the girls were grateful to him and were very much interested when he told them of his two sons who were in the war. Later, when the girls read of the death of his two sons in the paper, they went to the old man’s lonely cabin in the woods, but found themselves too late. According to a friendly neighbor, the old man had become temporarily insane at the terrible news, had wrecked his cabin in an insane frenzy, and disappeared. Later, at Wild Rose Lodge, the girls were frightened several times by a strange apparition lurking in the woods around the lodge and Moonlight Falls, a beautiful fall of water not far from the cottage where the girls were staying. The boys came home from France and helped the girls solve the mystery. (Summary from the next book)     [chương_files]