“Nothing definite,” answered Selwood. “All I heard was that Mr. Herapath was there, and there was something seriously wrong, and would we go down at once.”

Mr. Tertius made no comment. He became thoughtful and abstracted, and remained so during the journey down to Kensington. Peggie, too, said nothing as they sped along; as for Selwood, he was wondering what had happened, and reflecting on this sudden stirring up of mystery. There was mystery within that car—in the person of Mr. Tertius. During his three weeks’ knowledge of the Herapath household Selwood had constantly wondered who Mr. Tertius was, what his exact relationship was, what his position really was. He knew that he lived in Jacob Herapath’s house, but in a sense he was not of the family. He seldom presented himself at Herapath’s table, he was rarely seen about the house; Selwood remembered seeing him occasionally in Herapath’s study or in Peggie Wynne’s drawing-room. He had learnt sufficient to know that Mr. Tertius had rooms of his own in the house; two rooms in some upper region; one room on the ground-floor. Once Selwood had gained a peep into that ground-floor room, and had seen that it was filled with books, and that its table was crowded with papers, and he had formed the notion that Mr. Tertius was some book-worm or antiquary, to whom Jacob Herapath for some reason or other gave house-room. That he was no relation Selwood judged from the way in which he was always addressed by Herapath and by Peggie Wynne. To them as to all the servants he was Mr. Tertius—whether that was his surname or not, Selwood did not know.

There was nothing mysterious or doubtful about the great pile of buildings at which the automobile presently stopped. They were practical and concrete facts. Most people in London knew the famous Herapath Flats—they had aroused public interest from the time that their founder began building them.

Jacob Herapath, a speculator in real estate, had always cherished a notion of building a mass of high-class residential flats on the most modern lines. Nothing of the sort which he contemplated, he said, existed in London—when the opportunity came he would show the building world what could and should be done. The opportunity came when a parcel of land in Kensington fell into the market—Jacob Herapath made haste to purchase it, and he immediately began building on it. The result was a magnificent mass of buildings which possessed every advantage and convenience—to live in a Herapath flat was to live in luxury. Incidentally, no one could live in one who was not prepared to pay a rental of anything from five to fifteen hundred a year. The gross rental of the Herapath Flats was enormous—the net profits were enough to make even a wealthy man’s mouth water. And Selwood, who already knew all this, wondered, as they drove away, where all this wealth would go if anything had really happened to its creator.

The entrance to the Herapath estate office was in an archway which led to one of the inner squares of the great buildings. When the car stopped at it, Selwood saw that there were police within the open doorway. One of them, an inspector, came forward, looking dubiously at Peggie Wynne. Selwood hastened out of the car and made for him.

“I’m Mr. Herapath’s secretary—Mr. Selwood,” he said, drawing the inspector out of earshot. “Is anything seriously wrong?—better tell me before Miss Wynne hears. He isn’t—dead?”

The inspector gave him a warning look.

“That’s it, sir,” he answered in a low voice. “Found dead by the caretaker in his private office. And it’s here—Mr. Selwood, it’s either suicide or murder. That’s flat!”

Selwood got his two companions inside the building and into a waiting-room. Peggie turned on him at once.

“I see you know,” she said. “Tell me at once what it is. Don’t be afraid, Mr. Selwood—I’m not likely to faint nor to go into hysterics. Neither is Mr. Tertius. Tell us—is it the worst?”