the gruesome tragedy of the Greenes might have gone; for Vance—in one of those strange mental flashes of his which always seemed wholly intuitive but were, in reality, the result of long, subtle reasoning—remembered the incident at a crucial moment, and related it swiftly to other incidents which in themselves appeared trifling, but which, when co-ordinated, took on a tremendous and terrible importance.
During the second week following Chester Greene’s death the weather moderated markedly. We had several beautiful clear days, crisp, sunshiny, and invigorating. The snow had almost entirely disappeared, and the ground was firm, without any of the slush that usually follows a winter thaw. On Thursday Vance and I called at the Greene mansion earlier than on any previous visit, and we saw Doctor Von Blon’s car parked before the gate.
“Ah!” Vance observed. “I do hope the family Paracelsus is not departing immediately. The man lures me; and his exact relationship to the Greene family irks my curiosity.”
Von Blon, as a matter of fact, was preparing to go as we entered the hallway. Sibella and Ada, bundled in their furs, stood just behind him; and it was evident that they were accompanying him.
“It was such a pleasant day,” explained Von Blon, somewhat disconcertedly, “I thought I’d take the girls for a drive.”
“And you and Mr. Van Dine must come with us,” chimed in Sibella, smiling hospitably at Vance. “If the doctor’s temperamental driving affects your heart action, I promise to take the wheel myself. I’m really an expert chauffeur.”
I surprised a look of displeasure on Von Blon’s face; but Vance accepted the invitation without demur; and in a few moments we were riding across town, comfortably installed in the doctor’s big Daimler, with Sibella in front, next to the driver’s seat, and Ada between Vance and me in the tonneau.
We went north on Fifth Avenue, entered Central Park, and, emerging at the 72d Street entrance, headed for Riverside Drive. The Hudson River lay like a sheet of blue-grass below us, and the Jersey palisades in the still clear air of early afternoon were as plainly etched as a Degas drawing. At Dyckman Street we went up Broadway, and turned west on the Spuyten Duyvil Road to Palisade Avenue overlooking the old wooded estates along the water. We passed through a private roadway lined with hedges, turned inland again to Sycamore Avenue, and came out on the Riverdale Road. We drove through Yonkers, up North Broadway into Hastings, and then skirted the Longue Vue Hill. Beyond Dobbs Ferry we entered the Hudson Road, and at Ardsley again turned west beside the Country Club golf-links, and came out on the river level. Beyond the Ardsley Station a narrow dirt road ran up the hill along the water; and, instead of following the main highway to the east, we continued up this little-used road, emerging on a kind of plateau of wild pasture-land.
A mile or so farther on—about midway between Ardsley and Tarrytown—a small dun hill, like a boulder, loomed directly in our path. When we came to the foot of it, the road swung sharply to the west along a curved promontory. The turn was narrow and dangerous, with the steep upward slope of the hill on one side and the precipitous, rocky descent into the river on the other. A flimsy wooden fence had been built along the edge of the drop, though what possible protection it could be to a reckless or even careless driver I could not see.
As we came to the outermost arc of the little detour Von Blon brought the car to a stop, the front wheels pointing directly toward the precipice. A magnificent vista stretched before us. We could look up and down the Hudson for miles. And there was a sense of isolation about the spot, for the hill behind us completely shut off the country inland.
We sat for several moments taking in the unusual view. Then Sibella spoke. Her voice was whimsical, but a curious note of defiance informed it.
“What a perfectly ripping spot for a murder!” she exclaimed, leaning over and looking down the steep slope of the bluff. “Why run the risk of shooting people when all you have to do is to take them for a ride to this snug little shelf, jump from the car, and let them topple—machine and all—over the precipice? Just another unfortunate auto accident—and no one the wiser! . . . Really, I think I’ll take up crime in a serious way.”
I felt a shudder pass over Ada’s body, and I noticed that her face paled. Sibella’s comments struck me as particularly heartless and unthinking in view of the terrible experience through which her sister had so recently passed. The cruelty of her words evidently struck the doctor also, for he turned toward her with a look of consternation.
Vance glanced quickly at Ada, and then attempted to banish the embarrassment of the tense silence by remarking lightly:
“We refuse to take alarm, however, Miss Greene; for no one, d’ ye see, could seriously consider a criminal career on a day as perfect as this. Taine’s theory of climatic influences is most comfortin’ in moments like this.”
Von Blon said nothing, but his reproachful eyes did not leave Sibella’s face.
“Oh, let us go back!” cried Ada pitifully, nestling closer under the lap-robe, as if the air had suddenly become chill.
Without a word Von Blon reversed the machine; and a moment later we were on our way back to the city.
14. Captain Hagedorn was the expert who supplied Vance with the technical data in the Benson murder case, which made it possible for him to establish the height of the murderer.
15. It was Inspector Brenner who examined and reported on the chiselled jewel-box in the “Canary” murder case.
16. Among the famous cases mentioned as being in some manner comparable to the Greene shootings were the mass murders of Landru, Jean-Baptiste Troppmann, Fritz Haarmann, and Mrs. Belle Gunness; the tavern murders of the Benders; the Van der Linden poisonings in Holland; the Bela Kiss tin-cask strangling; the Rugeley murders of Doctor William Palmer; and the beating to death of Benjamin Nathan.
17. The famous impure-milk scandal was then to the fore, and the cases were just appearing on the court calendar. Also, at that time, there was an anti-gambling campaign in progress in New York; and the District Attorney’s office had charge of all the prosecutions.
CHAPTER XIII
THE THIRD TRAGEDY
(November 28 and November 30)
The following Sunday evening, November 28, Markham invited Inspector Moran and Heath to the Stuyvesant Club for an informal conference. Vance and I had dined with him and were present when the two police officials arrived. We retired to Markham’s favorite corner of the club’s lounge-room; and soon a general discussion of the Greene murders was under way.
“I’m rather amazed,” said the Inspector, his voice even quieter than usual, “that nothing has turned up to focus the inquiry. In the average murder case there are numerous lines to be explored, even if the right one is not hit upon immediately. But in this affair there appears to be nothing whatever on which to concentrate.”
“That fact in itself, I should say,” rejoined Vance, “constitutes a distinguishing characteristic of the case which shouldn’t be overlooked, don’t y’ know. It’s a clew of vital importance, and if only we could probe its significance I think we’d be on our way toward a solution.”
“A fine clew that is!” grumbled Heath. “ ‘What clew have you got, Sergeant?’ asks the Inspector. ‘Oh, a bully clew,’ says I. ‘And what is it?’ asks the Inspector. ‘The fact that there ain’t nothing to go on!’ says I.”
Vance smiled.
“You’re so literal, Sergeant! What I was endeavoring to express,