"What's that?" asked his chum, Rollo Harrington. "Liége? What on earth possesses you to suggest Liége? A crowded manufacturing town, with narrow streets and horrible _pavé_. I thought we decided to fight shy of heavy traffic?" The two speakers were seated at an open window of the Hôtel Doré, in the picturesque town of Dinant. In front of them flowed the Meuse; its placid water rippled with craft of varying sizes. Huge barges, towed by snorting tugs, were laboriously passing along the busy international waterway that serves an empire, a kingdom, and a republic. On the remote bank, and to the right of a bridge, were the quaint red-tiled houses of the town, above which rose the fantastic, pinnacled tower of the thirteenth-century church of Notre Dame, in turn overshadowed by the frowning limestone crag on which stands the citadel. Kenneth was a well-set-up English youth of seventeen. He was tall for his age, and withal broad-shouldered and well-knit. His features were dark, his skin burnt a deep tan by reason of more than a nodding acquaintance with an open-air life. In character and action he was impulsive. He had the happy knack of making up his mind on the spur of the moment, and yet at the same time forming a fairly sound judgment. He was quick, too, with his fingers, having been gifted with a keen, mechanical turn of mind. Rollo Barrington, who was his companion's junior by the space of three days, was rather the reverse of his versatile friend. He was shorter in height by a good four inches; he was slightly built, although he possessed an unlooked-for reserve of physical strength and endurance. He was fresh-complexioned, with blue eyes and wavy chestnut hair. If Kenneth acted upon impulse, Rollo went by rule of thumb. He was cool and calculating when occasion served; but when in the company of his chum he was generally content to allow his will to be dominated by the impetuous Everest. Both lads were at St. Cyprian's--a public school of note in the Home Counties. The vacation started about the middle of July, and it was the custom for the senior members to put in a fortnight's camp with the Officers' Training Corps during the latter part of that month. At the time this story opens--the first day of August, 1914--the two chums were on a motor-cycling tour through Northern France and Belgium. The parents of neither had offered any objection when their respective sons announced their intention of wandering through the high-roads and by-roads of that part of the Continent. Kenneth had sprung the suggestion upon his father like the proverbial bombshell; and Mr. Everest, who was largely responsible for his son's impetuosity, merely acquiesced by observing: "You lucky young dog! I didn't have the chance when I was your age. Well, I hope you'll have a good time."