"Because, Julie, you were hysterical, and I feared if interviewed, you might make some statement in all good faith which would do Miss Kathleen irreparable injury. I also believed that your absence would serve to divert suspicion until I had a chance to find the real criminal; I met you before the inquest, and did not realize that your disappearance could be used to militate against Miss Kathleen. As for Mrs. Robinson"--he laughed slightly--"she keeps a private sanitarium, but just now has no patients. You were perfectly safe there, and I had Connor detail an operative to see that Heinrich did not torment you." "What will become of Baron von Fincke?" "Chief Connor and the State Department will handle his case. Connor told me he found the Baron's next door neighbor--a man named Frank Lutz...." "Mercy, his wife's a member of the Sisters in Unity!" ejaculated Miss Kiametia. "Lutz has a complete wireless transmitting station," went on Miller. "He was stunned by his arrest, and attempted suicide; Connor believes he can induce him to tell the locations of the other relay stations. Lutz had the wireless antennae strung along the ceilings in the upper corridors of his house. He declares they have just perfected a method to overcome static interference." "And what about Heinrich?" asked Julie anxiously. "Will he escape?" "No, he will undoubtedly pay the penalty of his crime; Mitchell took him in charge. Coroner Penfield was here a short time ago," added Miller, turning to Miss Kiametia. "He assisted us to take Mrs. Whitney to her bedroom; I left Rosa, the cook, there." "Thank you," murmured Kathleen. "I think I had better go upstairs and see to everything," and the spinster rose. "Just a minute," Miller hesitated. "I felt that another and more determined attempt would be made to get Mr. Whitney's invention, Kathleen, and so suggested to him that he trust me with the drawings and specifications." "Did he?" "Yes, and I took them over and deposited them in the care of Chief Connor." "A capital idea," exclaimed Foster. "Then father's inventions are quite safe?" asked Kathleen. "Yes. One is a camera for taking a map of the country from an airship; the other, still more marvelous--glass armor." "Glass what!" chorused his listeners. "Armor. A suit woven from a combination of mica and glass which Mauser bullets cannot penetrate." "Good Lord!" Foster tugged at his hair until it stood upright. "We can discuss the inventions at another time," announced the spinster, recovering from her astonishment. "I'll be upstairs, Kathleen, if you want me." "Wait, I'm coming," but Foster turned on the threshold of the door, his curiosity mastering him. "There's just one question, Miss Kathleen; if you knew Karl von Mueller in Germany and, as you thought, met him here using the name of Charles Miller, why did you not at once conclude he was a German spy?"