She reached the house on Riverside Drive, but did not slacken the speed of the machine. She knew that Lord Wisbeach would be waiting for her there, and she did not wish to meet him just yet. She wanted to be alone. She was feeling depressed. She wondered if this was because she had just departed from her father, and decided that it was. His swift entrances into and exits from her life always left her temporarily restless. She drove on up the river. She meant to decide her problem one way or the other before she returned home.
Lord Wisbeach, meanwhile, was talking to Mrs. Pett and Willie, its inventor, about Partridgite. Willie, on hearing himself addressed, had turned slowly with an air of absent self-importance, the air of a great thinker disturbed in mid-thought. He always looked like that when spoken to, and there were those—Mr. Pett belonged to this school of thought—who held that there was nothing to him beyond that look and that he had built up his reputation as a budding mastermind on a foundation that consisted entirely of a vacant eye, a mop of hair through which he could run his fingers, and the fame of his late father.
Willie Partridge was the son of the great inventor, Dwight Partridge, and it was generally understood that the explosive, Partridgite, was to be the result of a continuation of experiments which his father had been working upon at the time of his death. That Dwight Partridge had been trying experiments in the direction of a new and powerful explosive during the last year of his life was common knowledge in those circles which are interested in such things. Foreign governments were understood to have made tentative overtures to him. But a sudden illness, ending fatally, had finished the budding career of Partridgite abruptly, and the world had thought no more of it until an interview in the Sunday Chronicle, that store-house of information about interesting people, announced that Willie was carrying on his father's experiments at the point where he had left off. Since then there had been vague rumours of possible sensational developments, which Willie had neither denied nor confirmed. He preserved the mysterious silence which went so well with his appearance.
Having turned slowly so that his eyes rested on Lord Wisbeach's ingenuous countenance, Willie paused, and his face assumed the expression of his photograph in the Chronicle.
"Ah, Wisbeach!" he said.
Lord Wisbeach did not appear to resent the patronage of his manner. He plunged cheerily into talk. He had a pleasant, simple way of comporting himself which made people like him.
"I was just telling Mrs. Pett," he said, "that I shouldn't be surprised if you were to get an offer for your stuff from our fellows at home before long. I saw a lot of our War Office men when I was in England, don't you know. Several of them mentioned the stuff."
Willie resented Partridgite as being referred to as "the stuff," but he made allowance. All Englishmen talked that way, he supposed.
"Indeed?" he said.
"Of course," said Mrs. Pett, "Willie is a patriot and would have to give our own authorities the first chance."
"Rather!"
"But you know what officials are all over the world. They are so sceptical and they move so slowly."
"I know. Our men at home are just the same as a rule. I've got a pal who invented something-or-other, I forget what, but it was a most decent little contrivance and very useful and all that; and he simply can't get them to say Yes or No about it. But, all the same, I wonder you didn't have some of them trying to put out feelers to you when you were in London."
"Oh, we were only in London a few hours. By the way, Lord Wisbeach, my sister—"—Mrs. Pett paused; she disliked to have to mention her sister or to refer to this subject at all, but curiosity impelled her—"my sister said that you are a great friend of her step-son, James Crocker. I didn't know that you knew him."
Lord Wisbeach seemed to hesitate for a moment.
"He's not coming over, is he? Pity! It would have done him a world of good. Yes, Jimmy Crocker and I have always been great pals. He's a bit of a nut, of course, . . . I beg your pardon! . . . I mean . . ." He broke off confusedly, and turned to Willie again to cover himself. "How are you getting on with the jolly old stuff?" he asked.
If Willie had objected to Partridgite being called "the stuff," he was still less in favour of its being termed "the jolly old stuff." He replied coldly.
"I have ceased to get along with the jolly old stuff."
"Struck a snag?" enquired Lord Wisbeach sympathetically.
"On the contrary, my experiments have been entirely successful. I have enough Partridgite in my laboratory to blow New York to bits!"
"Willie!" exclaimed Mrs. Pett. "Why didn't you tell me before? You know I am so interested."
"I only completed my work last night."
He moved off with an important nod. He was tired of Lord Wisbeach's society. There was something about the young man which he did not like. He went to find more congenial company in a group by the window.
Lord Wisbeach turned to his hostess. The vacuous expression had dropped from his face like a mask. A pair of keen and intelligent eyes met Mrs. Pett's.
"Mrs. Pett, may I speak to you seriously?"
Mrs. Pett's surprise at the alteration in the man prevented her from replying. Much as she liked Lord Wisbeach, she had never given him credit for brains, and it was a man with brains and keen ones who was looking at her now. She nodded.
"If your nephew has really succeeded in his experiments, you should be awfully careful. That stuff ought not to lie about in his laboratory, though no doubt he has hidden it as carefully as possible. It ought to be in a safe somewhere. In that safe in your library. News of this kind moves like lightning. At this very moment, there may be people watching for a chance of getting at the stuff."
Every nerve in Mrs. Pett's body, every cell of a brain which had for years been absorbing and giving out sensational fiction, quivered irrepressibly at these words, spoken in a low, tense voice which gave them additional emphasis. Never had she misjudged a man as she had misjudged Lord Wisbeach.
"Spies?" she quavered.
"They wouldn't call themselves that," said Lord Wisbeach. "Secret Service agents. Every country has its men whose only duty it is to handle this sort of work."
"They would try to steal Willie's—?" Mrs. Pett's voice failed.
"They would not look on it as stealing. Their motives would be patriotic. I tell you, Mrs. Pett, I have heard stories from friends of mine in the English Secret Service which would amaze you. Perfectly straight men in private life, but absolutely unscrupulous when at work. They stick at nothing—nothing. If I were you, I should suspect every one, especially every stranger." He smiled engagingly. "You are thinking that that is odd advice from one who is practically a stranger like myself. Never mind. Suspect me, too, if you like. Be on the safe side."