Of course Lanning was blamed for having them at his flat; he ought to have taken them back to the works. The fact that this would have meant missing Lady Chilcot's dance was an added mark against him, and suggested a neglect of duty.

Under the circumstances publicity was not desirable, and Christopher Quarles was asked to solve the mystery. Instructions were telegraphed to the various ports with a view to preventing the model and the plans being taken out of the country, and, as I have said, the professor and I entered upon a strenuous time.

All our preliminary information naturally came from Lanning, who appeared quite indifferent to his own position so long as the stolen property was recovered.

The man Winbush could throw little light upon the affair. He was in his own room when he had heard a noise in the passage and supposed his master had returned earlier than he expected. To make sure, he had gone to the dining-room, but before he could switch on the light he had been seized from behind, a pungent smell was in his nostrils, and he was only just beginning to recover consciousness when his master found him.

He had not seen his assailants, he could not say how many there were, and he was inclined to think one of them was a woman, he told Quarles, because when he first entered the dining-room there was a faint perfume which suggested a woman's presence.

"It was like a woman when she is dressed for a party," he said in explanation.

He had seen his master bring in the wooden case that afternoon, but he did not know what it contained.

As Zena said, it sounded a lame story, but Lanning believed it. Winbush had been connected with the family all his life, was devoted to him, and it was not likely he would know what the case contained. Lanning could only suppose that some man at the works had turned traitor, while Mr. Nixon gave it as his opinion that either France or Germany had pulled the strings of the robbery.

Acting under Quarles's instructions, I had an interview with Miss Chilcot. She corroborated Lanning's story in every detail so far as she was concerned, and incidentally I understood there was no more than a lover's quarrel between them. She had sat out with the young Silesian on purpose to annoy Richard. Certainly they had talked of aeroplaning; it was natural, since two days before she had seen some flying at Ranelagh, but Lanning's name had not been mentioned. Miss Chilcot knew nothing about the experiments which had taken place, nor was she aware that her lover was responsible for some of the improvements which had been made in stabilizers. Rather inconsequently she was annoyed that he had not confided in her. Miss Chilcot carried with her a faint odor of Parma violets. Quarles had told me to note particularly whether she used any kind of perfume.

I was convinced of two things; first, that she was telling the truth without concealing anything, and, secondly, that Mr. Lanning was likely to marry a very charming but rather exacting young woman. When I said so to Quarles he annoyed me by remarking that some women were capable of making lies sound much more convincing than the truth.