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 been fatal, and she must rely upon her friend’s powers of penetration to form a third in this singular procession.

Whilst these thoughts were passing in the pursuer’s mind, Gianapolis, lighting a cigarette, had thrown himself back in a corner of the cab and was mentally reviewing the events of the evening—that is, those events which were associated with Helen Cumberly. He was disappointed but hopeful: at any rate he had suffered no definite repulse. Without doubt, his reflections had been less roseate had he known that he was followed, not only by two, but by three trackers.

He had suspected for some time now, and the suspicion had made him uneasy, that his movements were being watched. Police surveillance he did not fear; his arrangements were too complete, he believed, to occasion him any ground for anxiety even though half the Criminal Investigation Department were engaged in dogging his every movement. He understood police methods very thoroughly, and all his experience told him that this elusive shadow which latterly had joined him unbidden, and of whose presence he was specially conscious whenever his steps led toward Palace Mansions, was no police officer.

He had two theories respecting the shadow—or, more properly, one theory which was divisible into two parts; and neither part was conducive to peace of mind. Many years, crowded with many