‘Did he seem anxious or perturbed?’ ‘Not at all, monsieur. He was just as usual.’ ‘Thank you, I am exceedingly obliged.’ Some silver changed hands, and Karl withdrew. ‘That is very satisfactory information, M. le Directeur. The only other point I want is the names and addresses of the two other occupants of the bus.’ These were ascertained with some slight difficulty--M. Guillaume Leblanc, rue Verte, Marseilles, and Mr. Henry Gordon, 327 Angus Lane, Sauchiehall Street, Glasgow--and the detectives bowed themselves out with compliments and thanks. ‘That’s a piece of luck,’ remarked Lefarge, as they drove towards the Gare du Nord. ‘Those men may have seen Felix at other stages of the journey, and we may be able to trace him the whole way.’ They spent the morning in the great station, interviewing ticket examiners and other officials, but without success. No one had seen either of the travellers. ‘The boat is more likely,’ observed Burnley. ‘If he is a constant traveller, some of the stewards will certainly know him.’ Taking the 4.00 p.m. train, they reached Bolougne as dusk was falling, and began their inquiries at the pier. Finding the _Pas de Calais_, which had made the run in which they were interested, would not leave till noon next day, they turned their steps to the local police station. There they saw the men who had been on duty when the boat left on the Sunday in question, but here again without getting any information. Then they went on board the steamer and sought the chief steward. ‘I know that gentleman, yes,’ he said when, after introducing themselves, Lefarge showed him Felix’s photograph. ‘He crosses frequently, once or twice a month, I should say. He is a M. Felix, but I cannot say where he lives, nor do I know anything else about him.’ ‘What we want to find out, monsieur, is when he last crossed. If you can tell us that, we shall be extremely obliged.’ The official considered. ‘I am afraid I could hardly be sure of that. He crossed both ways fairly lately. I should say about ten days or a fortnight ago, but I’m not sure of the exact date.’ ‘We think he crossed on Sunday, the 28th March. Can you think of anything that would confirm whether it was this date?’ ‘No, I cannot. You see there would be nothing to record it. We could not now trace the ticket he held, and there is no way in which the identity of our passengers is ascertained and noted. Speaking from memory, I should say that the date you mention is about correct, but I could not be sure.’ ‘Is there any one on board who might be able to help us?’ ‘I’m really very sorry, monsieur, but I don’t think there is. The captain, or one of the officers, might know him; I could not say.’ ‘Well, just one other question, monsieur. Was he travelling alone?’