The Duke interrupted me with a slight exclamation and a little wave of the hand. "I never dreamed that you were such an old woman, Lister," he said. "I am much obliged to you for your warning," he added, with some return of his old courtesy. "As it happens, however, I was already aware that this man was not Faraday himself, and I fancy that my precautions for guarding the Lorringham treasures are adequate." The Princess leaned a little forward. I sympathised with the Duke. In this faint, enchanting light, she was ravishingly beautiful. "Do not be too confident, dear host," she murmured. "If women were only made of sterner stuff, a lock has never been fashioned which could keep a pearl lover from your jewel chamber." The Duke smiled. "Nevertheless," he added, turning to me with a friendly gesture of dismissal, "you may sleep soundly to-night and as many nights as you remain under my roof. The spells are not yet woven which could charm those jewels from their cases." I made my way back to the Castle, a little confused. There seemed to be in the Duke's last words a subtle behest to me, a warning not to concern myself further in his affairs. And from three to six on this coming morning, Edwards was guard of the chamber, and my rôle of watcher was already established. It must have been within a few seconds of the chiming of a quarter past three, that the intense silence of the gallery, into which I had found my way without difficulty, was broken in even the slightest degree. Opposite where I crouched, in a high-backed chair, with a glass of cold water by his side, sat the custodian of the jewel chamber. A little to the right was the narrow passage leading to the Duke's apartments. Two electric lights were burning, and through one of the windows came pale splashes of faint moonlight. The effect was a weird and confusing illumination which made it hard to recognise even the simplest objects. The armoured figures cast fantastic shadows across the floor, the outline of the watching man seemed distorted and unreal, and the whole setting of the little scene was unnatural, a stimulus to nervous imagination. For this very reason I covered my eyes and looked again for a moment at the apparition which at first presented every semblance of the impossible. The second time I knew that I had not been deceived--I knew that something was happening.