And immediately the man turned back to the desk to renew his rummaging--in search of a key to fit the case, she guessed. But his business there was surprisingly abbreviated--interrupted in a fashion certainly as startling to him as to her who skulked and spied on the dark side of the folding doors. Neither received the least intimation that the door from the library to the hall had been opened. Sally, for one, remained firmly persuaded that they two were alone in the silent house until the instant when she saw a second man hurl himself upon the back of the first--a swift-moving shape of darkness, something almost feline in his grim, violent fury that afforded the victim no time either to turn or to lift a hand in self-defence. In a twinkling the two went headlong to the floor and disappeared, screened by the broad top of the table. There, presumably, Blue Serge recovered sufficiently from the shock of surprise to make some show of fighting back. Confused sounds of scuffling and hard breathing became audible, with a thump or two deadened by the rug; but more than that, nothing--never a word from either combatant. There was something uncanny in the silence of it all. For an instant Sally remained where she was, rooted in fright and wonder; but the next, and without in the least understanding how she had come there, she found herself by the open door in the entry-hall, just beyond the threshold of the library, commanding an unobstructed view of the conflict. Apparently this neared its culmination. Though he had gone down face forward, Blue Serge had contrived to turn over on his back, in which position he now lay, still struggling, but helpless, beneath the bulk of his assailant--a burly, blackavised scoundrel who straddled the chest of his prey, a knee pinning down either arm, both hands busy with efforts to make an unappetising bandana serve as a gag. Pardonably rewarded for this inconsiderate treatment, the fat one suddenly snatched one hand away, conveyed a bitten finger to his mouth, instantly spat it out together with a gust of masterful profanity and, the other taking advantage of the opportunity to renew his struggles, shifted his grip to Blue Serge's throat and, bending forward, strove with purpose undoubtedly murderous to get possession of the short Roman sword. It lay just an inch beyond his reach. He strained his utmost toward it, almost touched its haft with eager finger-tips. At this a strange thing happened--strangest of all to Sally. For she, who never in her life had touched firearm or viewed scene of violence more desperate than a schoolboy squabble, discovered herself inside the library, standing beside the desk and levelling at the head of the heavy villain the automatic pistol that had rested there. Simultaneously she was aware of the sound of her own voice, its accents perhaps a bit shaky, but none the less sharp, crying: "Stop! Don't you dare! Drop that sword and put up your hands! I say, put up your hands!"