supplied the meals, and the section also included several French mechanics, though of course all the drivers were fully competent to overhaul and repair their cars. From four to ten men and a number of ambulances were always on duty near the dressing stations, a few thousand yards from the front-line trenches—a dangerous post indeed, where the men were very often obliged to make a precipitous rush for their dugouts in order to escape the rain of devastating shells. Yes, there was plenty of action, plenty of thrill and excitement in the life. Chase, who had arrived but a short time before, during a lull in the fighting on that part of the western front, had as yet seen no dangerous service. The young chap was not very popular—persons of a sullen or taciturn disposition seldom are—and though he must have realized this he made no effort to turn the tide in his favor. Bodkins, the musical member of the unit, had just brought forth his banjo, ready to indulge in his favorite pastime, when a noise at the door stopped him. "Hello! Somebody's coming in," he exclaimed, looking up. At that moment the door opened, and a dim, very vague form was seen standing at the threshold about to enter. "Hello, fellows! Bon soir, Messieurs!" cried a cheery, youthful voice. Whereupon every one in the room except Chase gave utterance to a hearty shout of welcome, Dunstan Farrington's voice rising high above the others. "Hello yourself, Don Hale!" he shouted. "Back from your ten days' furlough, eh? You're a sight for sore eyes! Well, well, we're mighty glad to see you!" CHAPTER II A MYSTERY "Say, what kind of a time did you have in Paris, boy?" exclaimed Gideon Watts. "Give us the latest news from civilization. What's in that bundle? Newspapers, by Jove! Hooray!" It seemed as if every one in the room were intent upon shaking the newcomer's hand at the same identical moment. "Had a perfectly dandy trip," returned the smiling Don Hale. "Maybe I didn't enjoy every minute of it, too. What do you think?—I actually saw an air raid on Paris. But the anti-aircraft guns soon sent the Kaiser's bomb-droppers flying to the cover of the