He walked deep in thought, with shoulders drooping.

Beyond the clamorous glitter of the Place Pigalle, with its garish entertainment halls and all-night restaurants, there is a dark, narrow, winding lane ascending steeply to the great white sentinel church on the heights. Up this Matheson strode, still deep in thought, and his shadower followed. But, half-way up, a new factor cut sharply into the situation. Out of a ruelle crept two apaches with the stealthy glide of their class. One followed close behind Clifford Matheson, while the other stopped to watch the lane against the possible arrival of an agent de police.

The young man who had followed from the Rue Laffitte paused irresolute. On the one hand were his orders to shadow Matheson wherever he might go that night; on the other hand was his personal safety. He was keenly alive to the merciless ferocity of the Parisian apache, and he was unarmed. The wicked curved knife doubtless concealed under the belt of the apache turned the scale decisively in the mind of the shadower. He saw no call to risk his own life.

He gave up and retraced his steps, leaving Matheson to his fate.


CHAPTER IV
ON THE SCENT OF A MYSTERY

The name of the young man who had shadowed Matheson was Arthur Dean, and his position in life was that of a clerk in the Leadenhall Street office of Lars Larssen. The latter had brought him over to Paris as temporary secretary because the confidential secretary had happened to be ill and away from business at the moment when Matheson's letter arrived.

Young Dean bitterly repented his cowardice before he was five minutes distant from the narrow lane on the heights of Montmartre.

Not only had he left a fellow-countryman to possible violence and robbery, but his action would inevitably recoil on himself. To be even a temporary secretary to the great shipowner was a chance, an opportunity that most young business men of twenty-four would eagerly grasp at. He was throwing away his chance by this cowardly disobedience to orders—Lars Larssen was not the man to forgive an offence of that kind.

Dean turned on his tracks and again crossed the Place Pigalle. The lane behind was deserted. He mounted it and searched eagerly. His search was fruitless. Matheson was nowhere visible—nor the two apaches. To what had happened in that interval of ten minutes there was no clue.