Then and there the Imp, her feet still unconsciously dabbling in the river, told Monsieur in halting fashion the whole history of their discoveries about the portrait and their consequent conjectures. He listened to it all, an inscrutable expression in his eyes, till she had finished. When the recital was over he stood quite still for several moments, while the others waited breathlessly. "You are marvelous children--you Americans," he said at last, "especially petite Hélène here! Who would have dreamed that you could piece together this story so accurately, with so little ground to work on? Yes, so accurately, as far as its foundation goes, for there you are right, astonishingly right. But, my good little friends, your premises may be right, but your conclusions are most deplorably wrong." "Do you mean that we guessed right about the portrait and Louis, but were wrong about what _you_ intend to do?" demanded the Imp, scrambling to her feet and approaching Monsieur excitedly. "I will permit you to judge of that after you have heard my story," replied Monsieur. "For I will now put you in possession of the whole truth, since you have discovered so much. Allow me, if you please, to sit down, while I render this accounting of myself." CHAPTER XV MONSIEUR'S STORY He stepped up to the platform and took a seat on one end of an old bench that flanked one side of it. On the other end sat Carol and Sue. The Imp, unable in her excitement to remain seated anywhere, stood near him, her great, blue eyes wide with wonder. A catbird sang at intervals in the willow above them, and the incessant _lap-lap_ of the river ran like a musical accompaniment in their ears. Not one of the three girls was ever to forget this strange moment in their lives, not even its beautiful setting. "It is hard for me to know just where to begin," Monsieur at length broke the silence by saying. "But, as I have said, _mes enfants_, you three have worked out for yourselves a difficult problem, so perhaps it is best that I commence by telling you where you were right, and end by pointing out where you erred. I hasten to begin.