We found the spot which I had indicated admirably adapted for our purpose. One could sit on the stone roof, well back from the wall, and through one of the openings in the castellation see the top of the monument amongst the tree tops; and could yet be unobserved oneself from any other spot around. The angles of the castellation of the various walls shut out the tops of the other hills or mounds on every side. As the signs of our code were already complete we had only to fix on some means of signalling 'A' and 'B'. This we did by deciding that by daylight A should be signified by red and B by white and at night A by red and B by green. Thus by daylight two pocket handkerchiefs of red and white or two flowers of white and red; or a piece of paper and a red leaf or flower would suffice. We fixed on colour as the best representative, as the distance made simplicity necessary. By night an ordinary bicycle lamp with the lens covered could be used; the ordinary red and green side lights could be shown as required. Then and there we arranged that that very afternoon when I had left the castle I should steal back to the monument and we should make a trial of our signalling. Then we talked of other things. Alone there on the roof we could talk freely; and the moments flew swiftly by in a sweet companionship. Even if the subjects which we had to discuss were grim ones of danger and intrigue; of secret passages and malignant enemies; of spies and possibilities of harm to one or both of us, still mutuality of our troubles and dangers made their existence to us sweet. That we shared in common even such matters was dear to us both. I could not but be conscious of Marjory's growing love for me; and if I had to restrain myself now and again from throwing my arms round her and pressing her beautiful body close to me and sweeping her face with kisses, I was repaid when, as we descended she put both her hands in mine and said: "Oh Archie! you are good to me! and--and--I love you so!" Then she sank into my arms and our mouths met in a long, loving kiss. We decided that as there must be some hidden opening in the old chapel, we should make search for it the next day. I was to come soon after sunrise, for this we judged would be the time when the spies of both kinds would least expect movement from the castle. I was to come by the grass path between the trees into the old chapel where she would meet me and we should make our investigations together. After tea I came away. Marjory came out on the steps with me to see me off. As we bade each other good-bye she said aloud in case any one might be listening: "Remember, you are to come to tea to-morrow and to bring me the book. I am quite anxious to know how it ends. It is too bad of the librarian not to send us all the volumes at once!"