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Rh beyond query or doubt, the fact that Sir Charles Abingdon had not died from natural causes. Premonitions, intuitions, beliefs resting upon a foundation of strange dreams—these were helpful to himself, if properly employed, but they were not legal evidence. This first point achieved, the motive of the crime must be sought; and then—the criminal.

"One thing at a time," Harley finally murmured.

Turning his head, he glanced back at the traffic in the street behind him. The action was sheerly automatic. He had ceased to expect to detect the presence of any pursuer. Yet he was convinced that his every movement was closely watched. It was uncanny, unnerving, this consciousness of invisible surveillance. Now, as he looked, he started. The invisible had become the visible.

His cab was just on the point of turning on to the slope of Vauxhall Bridge. And fifty yards behind, speeding along the Embankment, was a small French car. The features of the driver he had no time to observe. But, peering eagerly through the window, showed the dark face of the passenger. The man's nationality it was impossible to determine, but the keen, almost savage interest, betrayed by the glittering black eyes, it was equally impossible to mistake.

If the following car had turned on to the bridge, Harley, even yet, might have entertained a certain doubt. But, mentally putting himself in the pursuer's place, he imagined himself detected and knew