She dressed for the street, called for her car, which she told Philip she would drive herself, and started toward Potter's hangar. She did not drive slowly; could not have driven slowly, for there was a certain frenzy upon her, driving her. Her car rushed along the broad street at reckless, headlong speed. Scarcely slackening her speed, she careened into the road that led toward the shore and the hangar, slammed on the brakes at the very door, and sprang out. She did not hesitate at the door, but snatched it open. Potter Waite was in the seat of a newer, smaller aeroplane than the old machine of their adventure. "Potter," she cried. "Potter...." He looked, sprang from the machine, and was before her in an instant, his face glorified, his eyes alight with joy. "Garde," he said, exultantly, "you've come!... You've come back to me!" She shrank from him, put out her hand as though to hold him away. "No," she whispered, in sudden terror. "No. Not that." "But you've come. You've come. I've dreamed it. I've seen you coming through that door." He stopped suddenly, stepped back, and the glory died upon his face. He needed no words to tell him love had not brought her. "I had to come," she cried. "There's going to be murder--here.... They know your engine is ready--that you wired yesterday.... They're going to blow it up--" "What's that?" he demanded. "How do you know I wired yesterday? Who told you? Nobody knows that but myself." "You mustn't ask.... You must promise. I can tell nothing--nothing except that they're coming to-night to blow up this place--to steal drawings if they can...." "Who?" "German spies.... You must believe me, but you mustn't ask me how I know. Promise you won't ask, or try to find out." "Not ask!... What do you mean? Tell me again." "To-night this building--with your watchman--is to be blown up. Some explosive called TNT.... It's true. How would I know about your telegram?... You must do something. You must stop it." "I'll stop it," he said, suddenly erect, menacing. He was not startled, she saw, not afraid. He would be ready. It was so she knew he would meet an emergency. "But you," he demanded, "how are you in this?" "You mustn't ask.... Isn't it enough that I've come to warn you--isn't that enough?" "No," he said, "it is not enough ... if you know these plotters. They are fighting against your country. They are dangerous. If you know them, if you can lead me to them, you must do it. Can't you see? It doesn't matter what stands in the way, you must do it.... For your country." "No," she said, in terror. "No.... I'd rather die. I can't.... I _won't_. I came here to warn you, because I trusted you. I've done all I can.... You must not ask more." "Why?" he asked, sternly.