The old man accompanied him without a word. As they reached the companionway, however, he spoke. "We must return to London at once," he said. "This same boat will take us back to Harwich."
"Yes," Duvall agreed, "unless we discover that Seltz is aboard."
"Seltz?" The Frenchman looked up, puzzled, yet with an expression of renewed hope in his eyes.
"Yes. We have apparently followed the wrong man. In that case, why not search for the right one. If Seltz is on board, we will follow him to Brussels. If not, we will return to London. We can make sure, when the passengers are discharged at Antwerp."
Dufrenne nodded eagerly. "It may indeed be possible," he remarked, as they entered the saloon.
Most of the passengers were on deck when the steamer reached her wharf at Antwerp, but in spite of a careful search, Duvall was unable to locate Seltz amongst them. He stood by the gang plank, watching the crowd as it left the boat, his eyes searching restlessly for the swarthy countenance of the barber. He had almost given up hope, when he saw a belated passenger hurriedly cross the deck and dart up the gang plank. He moved rapidly, his throat muffled in a blue neckcloth, his slouch hat pulled down over his eyes, but the glance which Duvall obtained of his somewhat scared face told him at once that he had located his man.
He signaled quietly to Dufrenne, who had been standing discreetly in the background for fear the barber might recognize him, and the two left the boat together, some forty or more yards in Seltz's rear.
They did not make any attempt to follow him closely. There seemed no room for doubt that he was bound for the train to Brussels, and Duvall and his companion followed along at a leisurely pace, showing nothing of the agitation they so keenly felt.
They purposely avoided any attempt to enter the same compartment with the barber, being satisfied when they saw him climb aboard the train. They did, however, watch the departing passengers at all stops, and when they rolled into the station at Brussels, they were certain that their man was aboard. Nor were they mistaken. They saw him alight, look swiftly about as though fearing that he was being followed, and then start at a rapid pace toward the street.
Duvall went after him at once, directing Dufrenne to go to the Hotel Metropole and secure a room in his own name, where he was to wait until he heard from his companion. These instructions given, the detective began to follow Seltz up the street.