French was fully aware that the whole of these elaborate considerations had the actual stability of a house of cards. Each and every one of his deductions might be erroneous and the facts might be capable of an entirely different construction. Still, there was at least a suggestion that Dangle might have left Antwerp by water shortly after two o’clock on the previous day. It was the one constructive idea French could evolve, and he decided that in the absence of anything better he would try to follow it up.

It was too late to do anything that night. After dinner, therefore, he had another walk, spent an hour in a cinema, and then went early to bed, so as to be fresh for his labors of the following day.

Chapter XVII.
On the Flood Tide

French was astir betimes next morning, and over his coffee and rolls and honey he laid his plans for the day. As to the next step of his investigation he had no doubt. He must begin by finding out what vessels had left the city after 2:00 p.m. on the previous Thursday. That done, he could go into the question of the passengers each carried, in the hope of learning that Dangle was among them.

At the outset he was faced by the handicap of being a stranger in a strange land. If Antwerp had been an English port he would have known just where to get his information, but here he was unfamiliar with the ropes. He did not know if all sailings were published in any paper or available to the public at any office; moreover, his ignorance of both French and Flemish precluded his mixing with clerks or dock loafers from whom he might pick up information. Of course there were the Belgian police, but he did not wish to apply to them if he could carry out his job by himself.

However, this part of his problem proved easier of solution than he had expected. Inquiries at the post office revealed the fact that there was a shipping agency in the Rue des Tanneurs, and soon he had reached the place, found a clerk who spoke English, and put his question.

When French wished to be suave, as he usually did, he could, so to speak, have wheedled his best bone from a bulldog. Now, explaining in a friendly and confidential manner who he was and why he wanted the information, he begged the other’s good offices. The clerk, flattered at being thus courteously approached, showed a willingness to assist, with the result that in ten minutes French had the particulars he needed.

He turned into a café, and calling for a bock, sat down to consider what he had learned. And of this the very first fact filled him with delight, as it seemed to fit in with the theory he had evolved.

On Thursday it had been high water at 2:30 p.m. By 2:30 the dock gates had been opened, and it appeared that, taking advantage of this, several steamers had left shortly after that hour.

This was distinctly encouraging, and French turned to the list of ships with a growing hope that the end of his investigation might be coming into sight. In all, eleven steamers had left the port on the day in question, between the hours of 2:00 and 6:00 p.m., the period he had included in his inquiry.