Zitts rolled his eyes and looked at Zoo without moving. Zoo put her arms around the back of her seat, which slightly resembled a man, kissed it lightly and leaped nimbly to her feet. She glided smoothly to a corner, her figure undulating gracefully, and set in motion a four-wheeled machine which rolled to the center of the room and paused. Panels began to slide back from the machine, revealing its insides. Meanwhile Zitts explained: "The news of your second best husband's death was on teleview," he said. "I was interested in the case purely from an academic standpoint. With the machine you see on your left I watched the ratcatchers tearing up your apartment. The machine is called a key-skeleton. There isn't another like it in our solar system. With this key-skeleton I can enter any apartment or domicile no matter how well it is locked. Not in the flesh, no. That would be far too much trouble. I simply bring your apartment into this room. Not materially, but three-dimensionally to all effect. I have already gone over your apartment thoroughly and can describe the man who killed your husband." * * * * * The woman's curving mouth popped open. "Why don't you tell the ratcatchers?" she wanted to know. Zitts shrugged. "I haven't the evidence to prove my theory. Besides, there is another phase of the case in which I am interested. The weapon which killed your husband was a strange, unearthly thing. Nothing like it is known to modern science. It is a hand weapon with a tube about six inches in length. Behind this tube is a six-chambered cylinder which appears to revolve when certain mechanisms are set in motion. Inscribed on it in ancient lettering is this legend: _Colt_. It is not known how this weapon works nor which end of it destroys. But the ratcatchers are going to experiment with it, and when they asked my advice I suggested that they hold the tube end of it toward their bodies. That seems the most harmless part of it. I also suggested that they line up behind one another when they do this, and stay away from the butt end of it. I expect to learn the results soon. Zoo! Turn on the machine." Just as the machine was turned on a loud bang sounded in the room, and the woman gasped as the view lit up and showed four uniformed ratcatchers sprawled on the floor of what was obviously the ratcatchers' lair. Zitts snorted in disgust.